31113616 has 20 divisors (see below), whose sum is σ = 60515100. Its totient is φ = 15496832.

The previous prime is 31113613. The next prime is 31113619. The reversal of 31113616 is 61631113.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31113613) and next prime (31113619).

It can be written as a sum of positive squares in 2 ways, for example, as 18835600 + 12278016 = 4340^2 + 3504^2 .

It is not an unprimeable number, because it can be changed into a prime (31113611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 690 + ... + 7918.

It is an arithmetic number, because the mean of its divisors is an integer number (3025755).

Almost surely, 2^31113616 is an apocalyptic number.

It is an amenable number.

31113616 is a deficient number, since it is larger than the sum of its proper divisors (29401484).

31113616 is a wasteful number, since it uses less digits than its factorization.

31113616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7506 (or 7500 counting only the distinct ones).

The product of its digits is 324, while the sum is 22.

The square root of 31113616 is about 5577.9580493224. The cubic root of 31113616 is about 314.5213727226.

Adding to 31113616 its reverse (61631113), we get a palindrome (92744729).

The spelling of 31113616 in words is "thirty-one million, one hundred thirteen thousand, six hundred sixteen".