Properties of the Number 129

One Hundred Twenty-Nine

Basics

Value: 128 → 129 → 130

Parity: odd

Prime: No

Previous Prime: 127

Next Prime: 131

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 43

Divisors: 1, 3, 43, 129

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000001

Octal: 201

Duodecimal: A9

Hexadecimal: 81

Square: 16641

Square Root: 11.357816691600547

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

Coordination sequence for planar net 3.3.3.3.6 (also called the fsz net). A250120

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

The odd numbers: a(n) = 2·n + 1. A5408

a(n) = 2ⁿ + 1. A51

Sum of the first n primes. A7504

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

Unary-encoded compressed factorization of natural numbers. A156552

a(n) = 3·n. A8585

Lucky numbers. A959

Evil numbers: nonnegative integers with an even number of 1's in their binary expansion. A1969

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