51235431604 has 12 divisors (see below), whose sum is σ = 102470863264. Its totient is φ = 21958042104.

The previous prime is 51235431547. The next prime is 51235431607. The reversal of 51235431604 is 40613453215.

51235431604 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 51235431604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51235431607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 914918394 + ... + 914918449.

Almost surely, 2^51235431604 is an apocalyptic number.

It is an amenable number.

51235431604 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51235431604 is a wasteful number, since it uses less digits than its factorization.

51235431604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1829836854 (or 1829836852 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

Adding to 51235431604 its reverse (40613453215), we get a palindrome (91848884819).

The spelling of 51235431604 in words is "fifty-one billion, two hundred thirty-five million, four hundred thirty-one thousand, six hundred four".