Properties of the Number 49

Forty-Nine

Basics

Value: 48 → 49 → 50

Parity: odd

Prime: No

Previous Prime: 47

Next Prime: 53

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 7 ²

Divisors: 1, 7, 49

Polygonal

Triangular: No

Square: Yes

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110001

Octal: 61

Duodecimal: 41

Hexadecimal: 31

Square: 2401

Square Root: 7

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

The squares: a(n) = n². A290

The positive integers. Also called the natural numbers, the whole numbers or the counting numbers, but these terms are ambiguous. A27

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

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

The composite numbers: numbers n of the form x·y for x > 1 and y > 1. A2808

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

The nonnegative integers. A1477

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

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