31021023028 has 6 divisors (see below), whose sum is σ = 54286790306. Its totient is φ = 15510511512.

The previous prime is 31021022959. The next prime is 31021023029. The reversal of 31021023028 is 82032012013.

It can be written as a sum of positive squares in only one way, i.e., 30881735824 + 139287204 = 175732^2 + 11802^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31021023029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3877627875 + ... + 3877627882.

Almost surely, 2^31021023028 is an apocalyptic number.

It is an amenable number.

31021023028 is a deficient number, since it is larger than the sum of its proper divisors (23265767278).

31021023028 is a wasteful number, since it uses less digits than its factorization.

31021023028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7755255761 (or 7755255759 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The spelling of 31021023028 in words is "thirty-one billion, twenty-one million, twenty-three thousand, twenty-eight".