31131696 has 80 divisors (see below), whose sum is σ = 84923136. Its totient is φ = 9808128.

The previous prime is 31131679. The next prime is 31131701. The reversal of 31131696 is 69613113.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179866 + ... + 180038.

Almost surely, 2^31131696 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31131696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42461568).

31131696 is an abundant number, since it is smaller than the sum of its proper divisors (53791440).

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

31131696 is a wasteful number, since it uses less digits than its factorization.

31131696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370 (or 364 counting only the distinct ones).

The product of its digits is 2916, while the sum is 30.

The square root of 31131696 is about 5579.5784787025. The cubic root of 31131696 is about 314.5822833038.

The spelling of 31131696 in words is "thirty-one million, one hundred thirty-one thousand, six hundred ninety-six".