31681164 has 24 divisors (see below), whose sum is σ = 74260480. Its totient is φ = 10512144.

The previous prime is 31681147. The next prime is 31681219. The reversal of 31681164 is 46118613.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3244 + ... + 8595.

Almost surely, 2^31681164 is an apocalyptic number.

It is an amenable number.

31681164 is an abundant number, since it is smaller than the sum of its proper divisors (42579316).

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

31681164 is a wasteful number, since it uses less digits than its factorization.

31681164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12069 (or 12067 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 31681164 is about 5628.6023131858. The cubic root of 31681164 is about 316.4222710175.

Adding to 31681164 its reverse (46118613), we get a palindrome (77799777).

The spelling of 31681164 in words is "thirty-one million, six hundred eighty-one thousand, one hundred sixty-four".