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Properties of the Number 18521

Eighteen Thousand Five Hundred Twenty-One

Basics

Value: 18520 → 18521 → 18522

Parity: odd

Prime: Yes

Previous Prime: 18517

Next Prime: 18523

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 18521

Divisors: 1, 18521

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100100001011001

Octal: 44131

Duodecimal: A875

Hexadecimal: 4859

Square: 343027441

Square Root: 136.09188072769072

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

Primes p with q = p + 2 and prime(q) + 2 both prime. A236457
Primes p such that p-1 and p+1 each contain at least one cubed prime in their prime factorization. A162870
The first member of a twin prime pair whose sum equals the sums of two consecutive smaller pairs of twin primes. A225943
Primes p such that p+2 and p3+2 are also prime. A240110
Primes p with same last two digits as k, where prime(k) = p. A232102
The prime numbers whose digit sum, adjacent digit sum concatenation, and adjacent digit difference concatenation are also primes. A330653
Integers k such that Euler(k, 1) is an integer multiple of Bernoulli(k + 1, 1). A342320
Lesser of twin self primes, i.e., smaller member of the pair of self primes differing by 2. A380713
Numbers k such that 50·Rk + 7 is prime, where Rk = 11...1 is the repunit (A002275) of length k. A56686
Primes p such that 7 is the largest of all prime factors of the numbers between p and the next prime (cf. A052248). A80186