Properties of the Number 549

Five Hundred Forty-Nine

Basics

Value: 548 → 549 → 550

Parity: odd

Prime: No

Previous Prime: 547

Next Prime: 557

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 61

Divisors: 1, 3, 9, 61, 183, 549

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1000100101

Octal: 1045

Duodecimal: 399

Hexadecimal: 225

Square: 301401

Square Root: 23.430749027719962

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

Odd numbers of the form p^1+4k * r², where p is prime of the form 1+4m, r > 1, and gcd(p,r) = 1. (Euler's criteria for odd perfect numbers). A228058

Number of flat partitions of n: partitions {a_i} with each |a_i - a_i-1| <= 1. A34296

Start with 1 and repeatedly reverse the decimal digits and add 4 to get the next term. A117828

Numbers k such that the k-th composition in standard order is a permutation (of an initial interval). A333218

Coefficients of the '5th-order' mock θ function chi₁(q). A53263

Numbers k such that the k-th composition in standard order is strictly decreasing. A333256

Numbers k such that k² + 2 is prime. A67201

Number of partitions of n-1 boys and one girl with no couple. A120452

a(n) = least k such that the remainder when 12^k is divided by k is n. A127820

a(n) = n*(3·n + 7)/2. A140090