Properties of the Number 61815

Sixty-One Thousand Eight Hundred Fifteen

Basics

Value: 61814 → 61815 → 61816

Parity: odd

Prime: No

Previous Prime: 61813

Next Prime: 61819

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 5 × 13 × 317

Divisors: 1, 3, 5, 13, 15, 39, 65, 195, 317, 951

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1111000101110111

Octal: 170567

Duodecimal: 2B933

Hexadecimal: f177

Square: 3821094225

Square Root: 248.62622548717582

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

Indices of primes in the 7th-order Fibonacci number sequence, A060455. A253318

Numbers n such that 3·4ⁿ - 1 is prime. A272057

G.f. A(x) satisfies A(x) = 1+∑_{j=0 to infinity} ((1 + x^j+1*A(x))^a_j-1). A61815

Number of nX4 0..1 arrays with every element equal to 0, 2, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. A303238