Properties of the Number 87889

Eighty-Seven Thousand Eight Hundred Eighty-Nine

Basics

Value: 87888 → 87889 → 87890

Parity: odd

Prime: No

Previous Prime: 87887

Next Prime: 87911

Digit Sum: 40

Digital Root: 4

Palindrome: No

Factorization: 179 × 491

Divisors: 1, 179, 491, 87889

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10101011101010001

Octal: 253521

Duodecimal: 42A41

Hexadecimal: 15751

Square: 7724476321

Square Root: 296.4607899874788

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 plus the lower median minus the minimum of every 2X2 subblock equal. A236789

Number of (n+1)X(2+1) 0..2 arrays with the upper median plus the lower median minus the minimum of every 2X2 subblock equal. A236783

Number of (n+1) X (5+1) 0..2 arrays with the upper median plus the lower median minus the minimum of every 2 X 2 subblock equal. A236786

Given a sequence u consisting just of 1's and 2's, let f(u)(n) be the length of n-th run. Then we may define a sequence u = {a(n)} by a(n)=f^n-1(u)(1) (starting with n=1). A87889