Properties of the Number 87109

Eighty-Seven Thousand One Hundred Nine

Basics

Value: 87108 → 87109 → 87110

Parity: odd

Prime: No

Previous Prime: 87107

Next Prime: 87119

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 11 × 7919

Divisors: 1, 11, 7919, 87109

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10101010001000101

Octal: 252105

Duodecimal: 424B1

Hexadecimal: 15445

Square: 7587977881

Square Root: 295.14233854193134

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

Expansion of e.g.f. ∏_k>=1 1 / (1 - sinh(x^k)). A330515

Number of (n+1) X (2+1) 0..3 arrays with no element unequal to a strict majority of its horizontal and vertical neighbors, with values 0..3 introduced in row major order. A231338

This table shows the coefficients of combinatorial formulas needed for generating the sequential sums of p-th powers of binomial coefficients C(n,5). The p-th row (p>=1) contains a(i,p) for i=1 to 5·p-4, where a(i,p) satisfies ∑_i=1..n C(i+4,5)^p = 6·C(n+5,6) * ∑_i=1..5·p-4 a(i,p) * C(n-1,i-1)/(i+5). A87109

Array read by antidiagonals: T(d,k) (k >= 1, d = 1,2,3,4,5,6,...) = smallest semiprime s of k (not necessarily consecutive) semiprimes in arithmetic progression with common difference d, or 0 if there is no such arithmetic progression. A124570

a(n) = sum of numbers formed using the digits of next n numbers. A81993