Properties of the Number 551

Five Hundred Fifty-One

Basics

Value: 550 → 551 → 552

Parity: odd

Prime: No

Previous Prime: 547

Next Prime: 557

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 19 × 29

Divisors: 1, 19, 29, 551

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1000100111

Octal: 1047

Duodecimal: 39B

Hexadecimal: 227

Square: 303601

Square Root: 23.473389188611005

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Generalized pentagonal numbers: m*(3·m - 1)/2, m = 0, +-1, +-2, +-3, .... A1318

Number of trees with n unlabeled nodes. A55

a(n) = n + (n+1)². A28387

Second pentagonal numbers: a(n) = n*(3·n + 1)/2. A5449

Number of partitions of n into parts 5k+2 or 5k+3. A3106

Digitally balanced numbers: positive numbers that in base 2 have the same number of 0's as 1's. A31443

Brilliant numbers: semiprimes (products of two primes, A001358) whose prime factors have the same number of decimal digits. A78972

Sieve of Eratosthenes arranged as an array and read by antidiagonals as A(1,1), A(1,2), A(2,1), A(1,3), A(2,2), A(3,1), ... A83221

Expansion of g.f. x/((1 - x)²*(1 - x³)). A1840

a(n) = 5·a(n-1) - a(n-2) for n > 1, a(0) = 0, a(1) = 1. A4254