51504531321 has 32 divisors (see below), whose sum is σ = 74729305728. Its totient is φ = 31425269760.

The previous prime is 51504531317. The next prime is 51504531341. The reversal of 51504531321 is 12313540515.

It is not a de Polignac number, because 51504531321 - 2² = 51504531317 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51504531341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 601821 + ... + 682053.

It is an arithmetic number, because the mean of its divisors is an integer number (2335290804).

Almost surely, 2^51504531321 is an apocalyptic number.

51504531321 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

51504531321 is a deficient number, since it is larger than the sum of its proper divisors (23224774407).

51504531321 is a wasteful number, since it uses less digits than its factorization.

51504531321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80601.

The product of its (nonzero) digits is 9000, while the sum is 30.

The spelling of 51504531321 in words is "fifty-one billion, five hundred four million, five hundred thirty-one thousand, three hundred twenty-one".