Properties of the Number 81524

Eighty-One Thousand Five Hundred Twenty-Four

Basics

Value: 81523 → 81524 → 81525

Parity: even

Prime: No

Previous Prime: 81517

Next Prime: 81527

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 ² × 89 × 229

Divisors: 1, 2, 4, 89, 178, 229, 356, 458, 916, 20381

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 10011111001110100

Octal: 237164

Duodecimal: 3B218

Hexadecimal: 13e74

Square: 6646162576

Square Root: 285.5240795449659

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

T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the upper median minus the lower median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one. A238046

Numbers n such that the sum of the prime factors of n equals the product of the digits of n. A67173

A113695(n-1) concatenated with A113695(n+1) divided by A113695(n). A113696

Number of (n+1)X(3+1) 0..2 arrays with the upper median minus the lower median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one. A238041

Irregular triangle read by rows: T(n,k) is the coefficient of x^k in the domination polynomial of the n X n king graph (n>=1, A075561(n)<=k<=n²). A378420

Number of (n+1)X(n+1) 0..2 arrays with the upper median minus the lower median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one. A238038

a(n) = A081523(n)/n. A81524

Number of 10-leaf rooted trees with n levels. A290364