Properties of the Number 61387

Sixty-One Thousand Three Hundred Eighty-Seven

Basics

Value: 61386 → 61387 → 61388

Parity: odd

Prime: No

Previous Prime: 61381

Next Prime: 61403

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 17 × 23 × 157

Divisors: 1, 17, 23, 157, 391, 2669, 3611, 61387

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: Yes

Tetrahedral: No

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Representations

Binary: 1110111111001011

Octal: 167713

Duodecimal: 2B637

Hexadecimal: efcb

Square: 3768363769

Square Root: 247.764000613487

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

G.f. satisfies: A(x) = (1+x) - x*(4+x)*A(x) + x*(3+2·x)*A(x)². A119371

Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 35 ones. A31803

Expansion of (1+13·x+32·x²+13·x³+x⁴)/(1-x)⁵. A160765

Heptagonal numbers (A000566) with prime indices (A000040). A346494

Heptagonal numbers which are products of three distinct primes. A356422

Sum of digits = 4 times number of digits. A61387