31979273 has 2 divisors, whose sum is σ = 31979274. Its totient is φ = 31979272.

The previous prime is 31979267. The next prime is 31979287. The reversal of 31979273 is 37297913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31326409 + 652864 = 5597^2 + 808^2 .

It is a cyclic number.

It is not a de Polignac number, because 31979273 - 2⁶ = 31979209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31979273.

It is not a weakly prime, because it can be changed into another prime (31979203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15989636 + 15989637.

It is an arithmetic number, because the mean of its divisors is an integer number (15989637).

Almost surely, 2^31979273 is an apocalyptic number.

It is an amenable number.

31979273 is a deficient number, since it is larger than the sum of its proper divisors (1).

31979273 is an equidigital number, since it uses as much as digits as its factorization.

31979273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71442, while the sum is 41.

The square root of 31979273 is about 5655.0219274553. The cubic root of 31979273 is about 317.4116496271.

The spelling of 31979273 in words is "thirty-one million, nine hundred seventy-nine thousand, two hundred seventy-three".