Properties of the Number 61940

Sixty-One Thousand Nine Hundred Forty

Basics

Value: 61939 → 61940 → 61941

Parity: even

Prime: No

Previous Prime: 61933

Next Prime: 61949

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 ² × 5 × 19 × 163

Divisors: 1, 2, 4, 5, 10, 19, 20, 38, 76, 95

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111000111110100

Octal: 170764

Duodecimal: 2BA18

Hexadecimal: f1f4

Square: 3836563600

Square Root: 248.87747989723778

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

a(n) = 3·a(n-1) - a(n-2) for n >= 2, with a(0) = a(1) = 1. A1519

Generalized pentagonal numbers: m*(3·m - 1)/2, m = 0, +-1, +-2, +-3, .... A1318

Numbers k such that 2·k² - 1 is a square. A1653

Number of overpartitions of n: an overpartition of n is an ordered sequence of nonincreasing integers that sum to n, where the first occurrence of each integer may be overlined. A15128

Triangle of trinomial coefficients T(n,k) (n >= 0, 0 <= k <= 2·n), read by rows: n-th row is obtained by expanding (1 + x + x²)ⁿ. A27907

Period 3: repeat [0, 1, 1]. A11655

NSW numbers: a(n) = 6·a(n-1) - a(n-2); also a(n)² - 2·b(n)² = -1 with b(n) = A001653(n+1). A2315

Bisection of Lucas sequence: a(n) = L(2·n+1). A2878

Periodic sequence 1,1,-1,-1; expansion of (1+x)/(1+x²). A57077

a(n) = 4·a(n-1) - a(n-2), with a(0) = 1, a(1) = 1. A1835