31979473 has 2 divisors, whose sum is σ = 31979474. Its totient is φ = 31979472.

The previous prime is 31979471. The next prime is 31979509. The reversal of 31979473 is 37497913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19820304 + 12159169 = 4452^2 + 3487^2 .

It is a cyclic number.

It is not a de Polignac number, because 31979473 - 2¹ = 31979471 is a prime.

Together with 31979471, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31979471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15989736 + 15989737.

It is an arithmetic number, because the mean of its divisors is an integer number (15989737).

Almost surely, 2^31979473 is an apocalyptic number.

It is an amenable number.

31979473 is a deficient number, since it is larger than the sum of its proper divisors (1).

31979473 is an equidigital number, since it uses as much as digits as its factorization.

31979473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 142884, while the sum is 43.

The square root of 31979473 is about 5655.0396108250. The cubic root of 31979473 is about 317.4123113286.

The spelling of 31979473 in words is "thirty-one million, nine hundred seventy-nine thousand, four hundred seventy-three".