31316357 has 2 divisors, whose sum is σ = 31316358. Its totient is φ = 31316356.

The previous prime is 31316323. The next prime is 31316359. The reversal of 31316357 is 75361313.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29008996 + 2307361 = 5386^2 + 1519^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31316357 is a prime.

Together with 31316359, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31316359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15658178 + 15658179.

It is an arithmetic number, because the mean of its divisors is an integer number (15658179).

Almost surely, 2^31316357 is an apocalyptic number.

It is an amenable number.

31316357 is a deficient number, since it is larger than the sum of its proper divisors (1).

31316357 is an equidigital number, since it uses as much as digits as its factorization.

31316357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5670, while the sum is 29.

The square root of 31316357 is about 5596.1019468912. The cubic root of 31316357 is about 315.2030504066.

The spelling of 31316357 in words is "thirty-one million, three hundred sixteen thousand, three hundred fifty-seven".