Properties of the Number 133

One Hundred Thirty-Three

Basics

Value: 132 → 133 → 134

Parity: odd

Prime: No

Previous Prime: 131

Next Prime: 137

Digit Sum: 7

Digital Root: 7

Palindrome: No

Factorization: 7 × 19

Divisors: 1, 7, 19, 133

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000101

Octal: 205

Duodecimal: B1

Hexadecimal: 85

Square: 17689

Square Root: 11.532562594670797

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

Expansion of ∏_k>=0 (1 + x^2k+1); number of partitions of n into distinct odd parts; number of self-conjugate partitions; number of symmetric Ferrers graphs with n nodes. A700

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

Central polygonal numbers: a(n) = n² - n + 1. A2061

Numbers in base 5. A7091

Numbers in base 4. A7090

Niven (or Harshad, or harshad) numbers: numbers that are divisible by the sum of their digits. A5349

Lucky numbers. A959

a(n) = 3·n + 1. A16777

a(n) = 4·n + 1. A16813

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