31315696 has 40 divisors (see below), whose sum is σ = 64817280. Its totient is φ = 14621376.

The previous prime is 31315693. The next prime is 31315699. The reversal of 31315696 is 69651313.

It is an interprime number because it is at equal distance from previous prime (31315693) and next prime (31315699).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31315693) 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, 14835 + ... + 16813.

It is an arithmetic number, because the mean of its divisors is an integer number (1620432).

Almost surely, 2^31315696 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 31315696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32408640).

31315696 is an abundant number, since it is smaller than the sum of its proper divisors (33501584).

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

31315696 is a wasteful number, since it uses less digits than its factorization.

31315696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2053 (or 2047 counting only the distinct ones).

The product of its digits is 14580, while the sum is 34.

The square root of 31315696 is about 5596.0428876126. The cubic root of 31315696 is about 315.2008327084.

The spelling of 31315696 in words is "thirty-one million, three hundred fifteen thousand, six hundred ninety-six".