31839913 has 4 divisors (see below), whose sum is σ = 36388480. Its totient is φ = 27291348.

The previous prime is 31839911. The next prime is 31839917. The reversal of 31839913 is 31993813.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31993813 = 17 ⋅1881989.

It is not a de Polignac number, because 31839913 - 2¹ = 31839911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31839911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2274273 + ... + 2274286.

It is an arithmetic number, because the mean of its divisors is an integer number (9097120).

Almost surely, 2^31839913 is an apocalyptic number.

It is an amenable number.

31839913 is a deficient number, since it is larger than the sum of its proper divisors (4548567).

31839913 is an equidigital number, since it uses as much as digits as its factorization.

31839913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4548566.

The product of its digits is 17496, while the sum is 37.

The square root of 31839913 is about 5642.6866827780. The cubic root of 31839913 is about 316.9499036825.

The spelling of 31839913 in words is "thirty-one million, eight hundred thirty-nine thousand, nine hundred thirteen".