51313239 has 12 divisors (see below), whose sum is σ = 74199736. Its totient is φ = 34171632.

The previous prime is 51313231. The next prime is 51313247. The reversal of 51313239 is 93231315.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51313231) and next prime (51313247).

It is not a de Polignac number, because 51313239 - 2³ = 51313231 is a prime.

It is a super-2 number, since 2×51313239² = 5266096993342242, 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 (51313231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7569 + ... + 12645.

Almost surely, 2^51313239 is an apocalyptic number.

51313239 is a deficient number, since it is larger than the sum of its proper divisors (22886497).

51313239 is a wasteful number, since it uses less digits than its factorization.

51313239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6206 (or 6203 counting only the distinct ones).

The product of its digits is 2430, while the sum is 27.

The square root of 51313239 is about 7163.3259733171. The cubic root of 51313239 is about 371.6006597396.

The spelling of 51313239 in words is "fifty-one million, three hundred thirteen thousand, two hundred thirty-nine".