31949913 has 8 divisors (see below), whose sum is σ = 42632800. Its totient is φ = 21283488.

The previous prime is 31949899. The next prime is 31949917. The reversal of 31949913 is 31994913.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31949913 - 2¹⁴ = 31933529 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31949917) 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 7 ways as a sum of consecutive naturals, for example, 1518 + ... + 8136.

It is an arithmetic number, because the mean of its divisors is an integer number (5329100).

Almost surely, 2^31949913 is an apocalyptic number.

It is an amenable number.

31949913 is a deficient number, since it is larger than the sum of its proper divisors (10682887).

31949913 is a wasteful number, since it uses less digits than its factorization.

31949913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8231.

The product of its digits is 26244, while the sum is 39.

The square root of 31949913 is about 5652.4254086189. The cubic root of 31949913 is about 317.3144819037.

The spelling of 31949913 in words is "thirty-one million, nine hundred forty-nine thousand, nine hundred thirteen".