31679243 has 2 divisors, whose sum is σ = 31679244. Its totient is φ = 31679242.

The previous prime is 31679239. The next prime is 31679273. The reversal of 31679243 is 34297613.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31679243 - 2² = 31679239 is a prime.

It is not a weakly prime, because it can be changed into another prime (31679233) 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 as a sum of consecutive naturals, namely, 15839621 + 15839622.

It is an arithmetic number, because the mean of its divisors is an integer number (15839622).

Almost surely, 2^31679243 is an apocalyptic number.

31679243 is a deficient number, since it is larger than the sum of its proper divisors (1).

31679243 is an equidigital number, since it uses as much as digits as its factorization.

31679243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 35.

The square root of 31679243 is about 5628.4316643271. The cubic root of 31679243 is about 316.4158754247.

The spelling of 31679243 in words is "thirty-one million, six hundred seventy-nine thousand, two hundred forty-three".