Properties of the Number 85991

Eighty-Five Thousand Nine Hundred Ninety-One

Basics

Value: 85990 → 85991 → 85992

Parity: odd

Prime: Yes

Previous Prime: 85933

Next Prime: 85999

Digit Sum: 32

Digital Root: 5

Palindrome: No

Factorization: 85991

Divisors: 1, 85991

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10100111111100111

Octal: 247747

Duodecimal: 4191B

Hexadecimal: 14fe7

Square: 7394452081

Square Root: 293.24222069817984

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

Number of refinement sequences n -> ... -> {1}ⁿ, where in each step one part that is the rightmost copy of its size is replaced by a partition of itself into smaller parts (in weakly decreasing order). A327702

a(n) is the smallest n-isolated prime, or a(n)=0 if there are no n-isolated primes. A218275

Primes prime(k) such that prime(k) + 2·prime(k+1), prime(k) + 2·prime(k+1) + 4·prime(k+2) and prime(k) + 2·prime(k+1) + 4·prime(k+2) + 8·prime(k+3) are all prime. A337214

a(n) = least prime P(n) such that P(n)-2·p(n) is prime and P(n+1)>P(n) with p(n)=n-th prime. A115972

Primes p where an integer r with 1 < r < p exists such that r^r == 1 (mod p²). A259505

Decimal expansion of the prime ζ modulo function at 2 for primes of the form 4k+3. A85991