Properties of the Number 78557

Seventy-Eight Thousand Five Hundred Fifty-Seven

Basics

Value: 78556 → 78557 → 78558

Parity: odd

Prime: No

Previous Prime: 78553

Next Prime: 78569

Digit Sum: 32

Digital Root: 5

Palindrome: No

Factorization: 17 × 4621

Divisors: 1, 17, 4621, 78557

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 10011001011011101

Octal: 231335

Duodecimal: 39565

Hexadecimal: 132dd

Square: 6171202249

Square Root: 280.28021692584724

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

(Provable) Sierpiński numbers: odd numbers n such that for all k >= 1 the numbers n·2^k + 1 are composite. A76336

Conjectured smallest Sierpiński numbers of the second kind S, base b=2,3,4,5,..., where S·bⁿ+1 is composite for all n>=1 and gcd(S+1, b-1) = 1. A123159

Odd integers n such that for every integer k>0, n·2^k+1 has a divisor in the set { 3, 5, 7, 13, 19, 37, 73 }. A244562

Smallest prime factor of 1+78557·2ⁿ, cf. A258073. A258091

a(n) = 1 + 78557·2ⁿ. A258073

Smallest Sierpinski number that is divisible by the n-th prime. A222534

Least k such that k·2^m + 1 has a covering set of modulus 2·n, or 0 if no such value exists. A257647

Numbers m, such that the smallest prime factor of 1+78557·2^m doesn't belong to the covering set {3, 5, 7, 13, 19, 37, 73}. A258095

Odd k for which k+2^m is composite for all m < k. A33919

Least k such that k·2^m + 1 has a covering set with precisely n primes. A206001