31979245 has 8 divisors (see below), whose sum is σ = 38590560. Its totient is φ = 25439760.

The previous prime is 31979237. The next prime is 31979249. The reversal of 31979245 is 54297913.

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

It is not a de Polignac number, because 31979245 - 2³ = 31979237 is a prime.

It is a super-2 number, since 2×31979245² = 2045344221540050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31979198 and 31979207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31979249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16971 + ... + 18760.

It is an arithmetic number, because the mean of its divisors is an integer number (4823820).

Almost surely, 2^31979245 is an apocalyptic number.

It is an amenable number.

31979245 is a deficient number, since it is larger than the sum of its proper divisors (6611315).

31979245 is a wasteful number, since it uses less digits than its factorization.

31979245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35915.

The product of its digits is 68040, while the sum is 40.

The square root of 31979245 is about 5655.0194517791. The cubic root of 31979245 is about 317.4115569887.

The spelling of 31979245 in words is "thirty-one million, nine hundred seventy-nine thousand, two hundred forty-five".