31680116 has 12 divisors (see below), whose sum is σ = 59704932. Its totient is φ = 14621568.

The previous prime is 31680113. The next prime is 31680119. The reversal of 31680116 is 61108613.

It is an interprime number because it is at equal distance from previous prime (31680113) and next prime (31680119).

It can be written as a sum of positive squares in 2 ways, for example, as 12931216 + 18748900 = 3596^2 + 4330^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31680113) 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, 304565 + ... + 304668.

It is an arithmetic number, because the mean of its divisors is an integer number (4975411).

Almost surely, 2^31680116 is an apocalyptic number.

It is an amenable number.

31680116 is a deficient number, since it is larger than the sum of its proper divisors (28024816).

31680116 is a wasteful number, since it uses less digits than its factorization.

31680116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609250 (or 609248 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 31680116 is about 5628.5092164800. The cubic root of 31680116 is about 316.4187819390.

Adding to 31680116 its reverse (61108613), we get a palindrome (92788729).

The spelling of 31680116 in words is "thirty-one million, six hundred eighty thousand, one hundred sixteen".