Properties of the Number 55439

Fifty-Five Thousand Four Hundred Thirty-Nine

Basics

Value: 55438 → 55439 → 55440

Parity: odd

Prime: Yes

Previous Prime: 55411

Next Prime: 55441

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 55439

Divisors: 1, 55439

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1101100010001111

Octal: 154217

Duodecimal: 280BB

Hexadecimal: d88f

Square: 3073482721

Square Root: 235.45487890464278

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 p+2, 2p+1, and 2p+3 are also prime. A69142

Primes p such that p+1 is a highly composite number. A72828

Primes p such that τ(p-1)+τ(p+1) is larger than for any previous term. (Smallest prime sandwiched between more composite numbers.) A90481

Smaller of twin primes whose middle term is a multiple of A002110(5)=2310. A60231

a(n) is the smallest prime q such that floor(σ(σ(q))/q) = n. A98222

Primes p for which σ(p+1)/σ(p) reaches a record value, where σ(k) is the divisor sum function (A000203). A326393

a(1)=1. a(n) = the smallest integer > a(n-1) such that d(a(n))+d(a(n)+1) > d(a(n-1))+d(a(n-1)+1), where d(m) = the number of divisors of m. A175143

a(n) is the smallest prime such that exactly n prime pairs (p,q) exist with a(n) = p·q + p + q. A198277

Prime p such that p and p+2 are twin primes and p²+p-1 p²+p+1 are also twin primes. A228968

Numbers k where records occur for d(k+1)/d(k), where d(k) is A000005(k). A282531