Properties of the Number 68821

Sixty-Eight Thousand Eight Hundred Twenty-One

Basics

Value: 68820 → 68821 → 68822

Parity: odd

Prime: Yes

Previous Prime: 68819

Next Prime: 68863

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 68821

Divisors: 1, 68821

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000110011010101

Octal: 206325

Duodecimal: 339B1

Hexadecimal: 10cd5

Square: 4736330041

Square Root: 262.33756879257686

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 such that q-p = 42, where q is the next prime after p. A134120

Primes of the form 50n² + 10n + 1. A154428

Primes p such that A066272(p)*p+1 is also prime, where A066272 is the number of anti-divisors. A209271

Primes of the form (4·k + 1)² + (4·k + 2)² where k=0,1,2,3,... A87871

Prime numbers p such that p - 2, p² - p - 1, p² - p + 1 are prime numbers. A274525

Prime(prime(n)) when prime(prime(n)) and n are twin primes. A87394

Binomial transform of [1, 3, 4, 3, 2, 0, 0, 0, ...]. A136395

Twin prime pairs p, p+2 such that p+(p+2)+1 and p*(p+2)+1 are both square. A166564

Triangular numbers such that both the number formed by the first floor((k+1)/2) digits and the remaining part (if any) are triangular numbers, where k is the number of digits. A68821

Number of length n+6 0..3 arrays with at most two downsteps in every n consecutive neighbor pairs. A255666