Properties of the Number 185

One Hundred Eighty-Five

Basics

Value: 184 → 185 → 186

Parity: odd

Prime: No

Previous Prime: 181

Next Prime: 191

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 5 × 37

Divisors: 1, 5, 37, 185

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10111001

Octal: 271

Duodecimal: 135

Hexadecimal: b9

Square: 34225

Square Root: 13.601470508735444

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

Semiprimes (or biprimes): products of two primes. A1358

Squarefree semiprimes: Numbers that are the product of two distinct primes. A6881

a(n) = 4·n + 1. A16813

a(n) = ∑_{d divides n} q(d), where q(d) = A000009 = number of partitions of d into distinct parts. A47966

a(n) = number of partitions of n into parts of 2 kinds. A712

Generalized Catalan numbers: a(n+1) = a(n) + ∑_k=1..n-1 a(k)*a(n-1-k). A4148

Pillai's arithmetical function: ∑_k=1..n gcd(k, n). A18804

Odd semiprimes: odd numbers divisible by exactly 2 primes (counted with multiplicity). A46315

Multiples of 5: a(n) = 5·n. A8587

Odd composite numbers. A71904

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