31313222388 has 72 divisors (see below), whose sum is σ = 93378521600. Its totient is φ = 8658031680.

The previous prime is 31313222383. The next prime is 31313222431. The reversal of 31313222388 is 88322231313.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31313222383) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1996363 + ... + 2011986.

Almost surely, 2^31313222388 is an apocalyptic number.

It is an amenable number.

31313222388 is an abundant number, since it is smaller than the sum of its proper divisors (62065299212).

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

31313222388 is a wasteful number, since it uses less digits than its factorization.

31313222388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4008397 (or 4008392 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The spelling of 31313222388 in words is "thirty-one billion, three hundred thirteen million, two hundred twenty-two thousand, three hundred eighty-eight".