Number

2,551

2,551 is a prime, odd.

Arithmetic Number Deficient Number Odious Number Prime Recamán's Sequence Sexy Prime Squarefree Twin Prime

Properties

Parity: Odd
Digit count: 4
Digit sum: 13
Digit product: 50
Digital root: 4
Palindrome: No
Bit width: 12 bits
Reversed: 1,552
Recamán's sequence: a(7,530) = 2,551
Square (n²): 6,507,601
Cube (n³): 16,600,890,151
Divisor count: 2
σ(n) — sum of divisors: 2,552
φ(n) — Euler's totient: 2,550

Primality

2,551 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)

1 · 2551

Aliquot sum (sum of proper divisors): 1

Factor pairs (a × b = 2,551)

1 × 2551

First multiples

2,551 · 5,102 (double) · 7,653 · 10,204 · 12,755 · 15,306 · 17,857 · 20,408 · 22,959 · 25,510

Sums & aliquot sequence

As consecutive integers: 1,275 + 1,276

Representations

In words: two thousand five hundred fifty-one
Ordinal: 2551st
Roman numeral: MMDLI
Binary: 100111110111
Octal: 4767
Hexadecimal: 0x9F7
Base64: Cfc=
One's complement: 62,984 (16-bit)

In other bases

ternary (3) 10111111

quaternary (4) 213313

quinary (5) 40201

senary (6) 15451

septenary (7) 10303

nonary (9) 3444

undecimal (11) 1a0a

duodecimal (12) 1587

tridecimal (13) 1213

tetradecimal (14) d03

pentadecimal (15) b51

Historical numeral systems

Babylonian (base 60): 𒌋𒌋𒌋𒌋𒁹𒁹 𒌋𒌋𒌋𒁹
Egyptian hieroglyphic: 𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓏺
Greek (Milesian): ͵βφναʹ
Mayan (base 20): 𝋦·𝋧·𝋫
Chinese: 二千五百五十一
Chinese (financial): 貳仟伍佰伍拾壹

In other modern scripts

Eastern Arabic ٢٥٥١ Devanagari २५५१ Bengali ২৫৫১ Tamil ௨௫௫௧ Thai ๒๕๕๑ Tibetan ༢༥༥༡ Khmer ២៥៥១ Lao ໒໕໕໑ Burmese ၂၅၅၁

Digit at this position in famous constants

π — Pi (π): Digit 2,551 = 7
e — Euler's number (e): Digit 2,551 = 8
φ — Golden ratio (φ): Digit 2,551 = 7
√2 — Pythagoras's (√2): Digit 2,551 = 3
ln 2 — Natural log of 2: Digit 2,551 = 9
γ — Euler-Mascheroni (γ): Digit 2,551 = 3

Also seen as

Prime neighborhood

Adjacent primes:

Previous prime: 2,549 (gap of 2)
Next prime: 2,557 (gap of 6)

Pair status: twin with 2549, sexy with 2557.

Unicode codepoint

৷

Bengali Currency Numerator Four

U+09F7

Other number (No)

UTF-8 encoding: E0 A7 B7 (3 bytes).

Lookup U+09F7 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#0009F7

RGB(0, 9, 247)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.9.247.

Address: 0.0.9.247
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.9.247

Unspecified address (0.0.0.0/8) — "this network" placeholder.

Position in π

The digit sequence 2551 first appears in π at position 1,569 of the decimal expansion (the 1,569ordinal-suffix:th digit after the integer 3).

Search range: the first 1,000,000 fractional digits of π. Any 6-digit-or-shorter string is virtually guaranteed to appear in there — the more interesting signal is the position.

Look up 2551 on Pi Search ↗