31313488 has 20 divisors (see below), whose sum is σ = 63308448. Its totient is φ = 14975840.

The previous prime is 31313479. The next prime is 31313489. The reversal of 31313488 is 88431313.

It is a super-2 number, since 2×31313488² = 1961069061452288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31313489) 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, 42178 + ... + 42913.

Almost surely, 2^31313488 is an apocalyptic number.

It is an amenable number.

31313488 is an abundant number, since it is smaller than the sum of its proper divisors (31994960).

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

31313488 is a wasteful number, since it uses less digits than its factorization.

31313488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85122 (or 85116 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 31313488 is about 5595.8456018729. The cubic root of 31313488 is about 315.1934244980.

The spelling of 31313488 in words is "thirty-one million, three hundred thirteen thousand, four hundred eighty-eight".