Properties of the Number 68513

Sixty-Eight Thousand Five Hundred Thirteen

Basics

Value: 68512 → 68513 → 68514

Parity: odd

Prime: No

Previous Prime: 68507

Next Prime: 68521

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 131 × 523

Divisors: 1, 131, 523, 68513

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000101110100001

Octal: 205641

Duodecimal: 33795

Hexadecimal: 10ba1

Square: 4694031169

Square Root: 261.74988061124304

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

Numerators of partial sums of (p+q)/p·q, where p and q are primes. A120831

Numerators of the partial sums of the reciprocals of the alternating sum of divisors function (A206369). A379619

Smallest number m such that prime(n) is a factor of both m and σ(m). A156099

Odd numbers k which satisfy the congruence 5^2k-1 == 3^2k-1 (mod 2k). A215738

a(0) = 15; for n > 0, a(n) is the smallest triangular number which is a (proper) multiple of a(n-1). A68513