Properties of the Number 18691

Eighteen Thousand Six Hundred Ninety-One

Basics

Value: 18690 → 18691 → 18692

Parity: odd

Prime: Yes

Previous Prime: 18679

Next Prime: 18701

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 18691

Divisors: 1, 18691

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100100000011

Octal: 44403

Duodecimal: A997

Hexadecimal: 4903

Square: 349353481

Square Root: 136.71503209230505

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

Partial sums of A299289. A299290

a(n) = 15·n² + 9·n + 1. A134153

Primes p such that the sum of the digits of p is not prime, but the sum of the cubes of the digits of p is prime. A91365

Prime p1 of consecutive primes p1, p2, where p2-p1=10, and p1, p2 are in different centuries. A160500

Number of rooted trees on n nodes with strictly thinning limbs. A298304

Number of partitions of floor(5n/2) into n nonnegative integers each no more than 5. A1975

Number of n-length ternary words avoiding runs of zeros of length 1 (mod 3). A255630

Primes of form 210·p + 1 where p is a prime. A51648

a(n) is the largest prime < 5·a(n-1) for n > 1, with a(1) = 2. A126033

Primes p such that p·floor(p/2)-2 and p·floor(p/2)+2 are also prime numbers. A164621