Properties of the Number 123

One Hundred Twenty-Three

Basics

Value: 122 → 123 → 124

Parity: odd

Prime: No

Previous Prime: 113

Next Prime: 127

Digit Sum: 6

Digital Root: 6

Palindrome: No

Factorization: 3 × 41

Divisors: 1, 3, 41, 123

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111011

Octal: 173

Duodecimal: A3

Hexadecimal: 7b

Square: 15129

Square Root: 11.090536506409418

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

Lucas numbers beginning at 2: L(n) = L(n-1) + L(n-2), L(0) = 2, L(1) = 1. A32

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

Sum of proper divisors (or aliquot parts) of n: sum of divisors of n that are less than n. A1065

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

Toothpick sequence (see Comments lines for definition). A139250

Lucas numbers (beginning with 1): L(n) = L(n-1) + L(n-2) with L(1) = 1, L(2) = 3. A204

Numbers in base 5. A7091

Numbers in base 4. A7090

a(n) = 3·n. A8585

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