31523012320 has 24 divisors (see below), whose sum is σ = 74473116984. Its totient is φ = 12609204864.

The previous prime is 31523012291. The next prime is 31523012363. The reversal of 31523012320 is 2321032513.

It is a junction number, because it is equal to n+sod(n) for n = 31523012291 and 31523012300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98509254 + ... + 98509573.

It is an arithmetic number, because the mean of its divisors is an integer number (3103046541).

Almost surely, 2^31523012320 is an apocalyptic number.

It is an amenable number.

31523012320 is an abundant number, since it is smaller than the sum of its proper divisors (42950104664).

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

31523012320 is a wasteful number, since it uses less digits than its factorization.

31523012320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197018842 (or 197018834 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

Adding to 31523012320 its reverse (2321032513), we get a palindrome (33844044833).

The spelling of 31523012320 in words is "thirty-one billion, five hundred twenty-three million, twelve thousand, three hundred twenty".