Properties of the Number 121

One Hundred Twenty-One

Basics

Value: 120 → 121 → 122

Parity: odd

Prime: No

Previous Prime: 113

Next Prime: 127

Digit Sum: 4

Digital Root: 4

Palindrome: Yes

Factorization: 11 ²

Divisors: 1, 11, 121

Polygonal

Triangular: No

Square: Yes

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111001

Octal: 171

Duodecimal: A1

Hexadecimal: 79

Square: 14641

Square Root: 11

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: Yes

Fermat Number: No

Cullen Number: No

OEIS Sequences

The squares: a(n) = n². A290

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

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

Powers of primes. Alternatively, 1 and the prime powers (p^k, p prime, k >= 1). A961

Completely multiplicative with a(prime(k)) = prime(k+1). A3961

Palindromes in base 10. A2113

Perfect powers: m^k where m > 0 and k >= 2. A1597

Numbers that are not squarefree. Numbers that are divisible by a square greater than 1. The complement of A005117. A13929

Squares of primes. A1248

Powerful numbers, definition (1): if a prime p divides n then p² must also divide n (also called squareful, square full, square-full or 2-powerful numbers). A1694

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