31303013 has 12 divisors (see below), whose sum is σ = 38331360. Its totient is φ = 25418232.

The previous prime is 31302989. The next prime is 31303021. The reversal of 31303013 is 31030313.

It is not a de Polignac number, because 31303013 - 2²⁰ = 30254437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31303033) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15881 + ... + 17742.

It is an arithmetic number, because the mean of its divisors is an integer number (3194280).

Almost surely, 2^31303013 is an apocalyptic number.

It is an amenable number.

31303013 is a deficient number, since it is larger than the sum of its proper divisors (7028347).

31303013 is a wasteful number, since it uses less digits than its factorization.

31303013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33656 (or 33649 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 14.

The square root of 31303013 is about 5594.9095613781. The cubic root of 31303013 is about 315.1582743699.

Adding to 31303013 its reverse (31030313), we get a palindrome (62333326).

The spelling of 31303013 in words is "thirty-one million, three hundred three thousand, thirteen".