31112013 has 16 divisors (see below), whose sum is σ = 42425856. Its totient is φ = 20274240.

The previous prime is 31112009. The next prime is 31112021. The reversal of 31112013 is 31021113.

It is not a de Polignac number, because 31112013 - 2² = 31112009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31112013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31112033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35620 + ... + 36482.

It is an arithmetic number, because the mean of its divisors is an integer number (2651616).

Almost surely, 2^31112013 is an apocalyptic number.

It is an amenable number.

31112013 is a deficient number, since it is larger than the sum of its proper divisors (11313843).

31112013 is a wasteful number, since it uses less digits than its factorization.

31112013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 31112013 is about 5577.8143568964. The cubic root of 31112013 is about 314.5159711602.

Adding to 31112013 its reverse (31021113), we get a palindrome (62133126).

The spelling of 31112013 in words is "thirty-one million, one hundred twelve thousand, thirteen".