51358239 has 8 divisors (see below), whose sum is σ = 76086320. Its totient is φ = 34238808.

The previous prime is 51358189. The next prime is 51358243. The reversal of 51358239 is 93285315.

It is not a de Polignac number, because 51358239 - 2⁸ = 51357983 is a prime.

It is a super-2 number, since 2×51358239² = 5275337426362242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51350239) 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, 951052 + ... + 951105.

It is an arithmetic number, because the mean of its divisors is an integer number (9510790).

Almost surely, 2^51358239 is an apocalyptic number.

51358239 is a deficient number, since it is larger than the sum of its proper divisors (24728081).

51358239 is a wasteful number, since it uses less digits than its factorization.

51358239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1902166 (or 1902160 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 51358239 is about 7166.4662840203. The cubic root of 51358239 is about 371.7092551312.

The spelling of 51358239 in words is "fifty-one million, three hundred fifty-eight thousand, two hundred thirty-nine".