31718939 has 8 divisors (see below), whose sum is σ = 36791808. Its totient is φ = 26781480.

The previous prime is 31718927. The next prime is 31718959. The reversal of 31718939 is 93981713.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31718939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31718896 and 31718905.

It is not an unprimeable number, because it can be changed into a prime (31718959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33347 + ... + 34284.

It is an arithmetic number, because the mean of its divisors is an integer number (4598976).

Almost surely, 2^31718939 is an apocalyptic number.

31718939 is a deficient number, since it is larger than the sum of its proper divisors (5072869).

31718939 is an equidigital number, since it uses as much as digits as its factorization.

31718939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67705.

The product of its digits is 40824, while the sum is 41.

The square root of 31718939 is about 5631.9569423070. The cubic root of 31718939 is about 316.5479829786.

The spelling of 31718939 in words is "thirty-one million, seven hundred eighteen thousand, nine hundred thirty-nine".