31955013 has 32 divisors (see below), whose sum is σ = 50342400. Its totient is φ = 19994688.

The previous prime is 31954999. The next prime is 31955059. The reversal of 31955013 is 31055913.

It is not a de Polignac number, because 31955013 - 2¹⁰ = 31953989 is a prime.

It is a super-2 number, since 2×31955013² = 2042245711660338, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31955713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28420 + ... + 29522.

It is an arithmetic number, because the mean of its divisors is an integer number (1573200).

Almost surely, 2^31955013 is an apocalyptic number.

It is an amenable number.

31955013 is a deficient number, since it is larger than the sum of its proper divisors (18387387).

31955013 is a wasteful number, since it uses less digits than its factorization.

31955013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178 (or 1172 counting only the distinct ones).

The product of its (nonzero) digits is 2025, while the sum is 27.

The square root of 31955013 is about 5652.8765243900. The cubic root of 31955013 is about 317.3313647641.

The spelling of 31955013 in words is "thirty-one million, nine hundred fifty-five thousand, thirteen".