Properties of the Number 90865

Ninety Thousand Eight Hundred Sixty-Five

Basics

Value: 90864 → 90865 → 90866

Parity: odd

Prime: No

Previous Prime: 90863

Next Prime: 90887

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 5 × 17 × 1069

Divisors: 1, 5, 17, 85, 1069, 5345, 18173, 90865

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10110001011110001

Octal: 261361

Duodecimal: 44701

Hexadecimal: 162f1

Square: 8256448225

Square Root: 301.43821920917725

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

a(n) = n·a(n-1) - a(n-2), with a(-1) = 0, a(0) = 1. A58797

Array (a frieze pattern) defined by a(n,k) = (a(n-1,k)*a(n-1,k+1) - 1) / a(n-2,k+1), read by antidiagonals. A7754

Number of set partitions of strict multiset partitions of integer partitions of n. A330452

Expansion of 1/(1 - 5·x - 4·x³). A60928

Number of n X 1 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of elements above it, modulo 4. A239812

a(0) = 0, a(1) = 1, a(2·n) = n·a(2·n-1) + a(2·n-2), a(2·n+1) = a(2·n) + a(2·n-1). A56921

Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where A(n,k) is ∑_{j=0..floor(n/2)} ((n-j)!/j!)*binomial(n-j,j)*k^n-2·j*(-1)^j. A305466

Numerators of continued fraction for left factorial. A56889

Strong pseudoprimes to base 86. A20312

a(n) = (n-1)*a(n-1)-a(n-2), a(0)=0, a(1)=1. A121965