31013109 has 24 divisors (see below), whose sum is σ = 46275840. Its totient is φ = 20004192.

The previous prime is 31013089. The next prime is 31013137. The reversal of 31013109 is 90131013.

It is not a de Polignac number, because 31013109 - 2⁵ = 31013077 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31013091 and 31013100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31013159) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37272 + ... + 38094.

It is an arithmetic number, because the mean of its divisors is an integer number (1928160).

Almost surely, 2^31013109 is an apocalyptic number.

It is an amenable number.

31013109 is a deficient number, since it is larger than the sum of its proper divisors (15262731).

31013109 is a wasteful number, since it uses less digits than its factorization.

31013109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961 (or 958 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 18.

The square root of 31013109 is about 5568.9414613551. The cubic root of 31013109 is about 314.1823389549.

The spelling of 31013109 in words is "thirty-one million, thirteen thousand, one hundred nine".