31166988 has 24 divisors (see below), whose sum is σ = 73148208. Its totient is φ = 10328256.

The previous prime is 31166981. The next prime is 31167007. The reversal of 31166988 is 88966113.

It is a super-2 number, since 2×31166988² = 1942762281984288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31166981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5431 + ... + 9582.

It is an arithmetic number, because the mean of its divisors is an integer number (3047842).

Almost surely, 2^31166988 is an apocalyptic number.

It is an amenable number.

31166988 is an abundant number, since it is smaller than the sum of its proper divisors (41981220).

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

31166988 is a wasteful number, since it uses less digits than its factorization.

31166988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15193 (or 15191 counting only the distinct ones).

The product of its digits is 62208, while the sum is 42.

The square root of 31166988 is about 5582.7401873990. The cubic root of 31166988 is about 314.7011123078.

The spelling of 31166988 in words is "thirty-one million, one hundred sixty-six thousand, nine hundred eighty-eight".