51591239 has 8 divisors (see below), whose sum is σ = 59007648. Its totient is φ = 44186400.

The previous prime is 51591229. The next prime is 51591247. The reversal of 51591239 is 93219515.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51591239 - 2²⁰ = 50542663 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51591199 and 51591208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51591229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11369 + ... + 15245.

It is an arithmetic number, because the mean of its divisors is an integer number (7375956).

Almost surely, 2^51591239 is an apocalyptic number.

51591239 is a deficient number, since it is larger than the sum of its proper divisors (7416409).

51591239 is a wasteful number, since it uses less digits than its factorization.

51591239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5785.

The product of its digits is 12150, while the sum is 35.

The square root of 51591239 is about 7182.7041565138. The cubic root of 51591239 is about 372.2705257512.

The spelling of 51591239 in words is "fifty-one million, five hundred ninety-one thousand, two hundred thirty-nine".