51540831238 has 32 divisors (see below), whose sum is σ = 86916908736. Its totient is φ = 22743671808.

The previous prime is 51540831197. The next prime is 51540831283. The reversal of 51540831238 is 83213804515.

It is a super-2 number, since 2×51540831238² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51540831238.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1413006 + ... + 1449022.

It is an arithmetic number, because the mean of its divisors is an integer number (2716153398).

Almost surely, 2^51540831238 is an apocalyptic number.

51540831238 is a deficient number, since it is larger than the sum of its proper divisors (35376077498).

51540831238 is a wasteful number, since it uses less digits than its factorization.

51540831238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38448.

The product of its (nonzero) digits is 115200, while the sum is 40.

The spelling of 51540831238 in words is "fifty-one billion, five hundred forty million, eight hundred thirty-one thousand, two hundred thirty-eight".