Properties of the Number 6991

Six Thousand Nine Hundred Ninety-One

Basics

Value: 6990 → 6991 → 6992

Parity: odd

Prime: Yes

Previous Prime: 6983

Next Prime: 6997

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 6991

Divisors: 1, 6991

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1101101001111

Octal: 15517

Duodecimal: 4067

Hexadecimal: 1b4f

Square: 48874081

Square Root: 83.61220006673668

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 congruent to 2 mod 29. A141978

Balanced primes of order four. A82079

Primes with either no internal digits or all internal digits are 9. A69684

Primes that are the sum of 11 consecutive primes. A127340

Number of integer partitions of n such that every pair of distinct parts has a different product. A325856

Father primes of order 9. A136078

Triangle read by rows: row n (n>=2) gives a set of n primes with the property that the pairwise averages are all primes, having the smallest largest element. A113832

Primes p such that A001177(p) = (p-1)/3. A308796

Primes having only {1, 6, 9} as digits. A363023

Primes p such that the largest prime factor of p+1 has Erdős-Selfridge class+ < N-1 if p is of class N+. A129470