31597493 has 2 divisors, whose sum is σ = 31597494. Its totient is φ = 31597492.

The previous prime is 31597483. The next prime is 31597507. The reversal of 31597493 is 39479513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31281649 + 315844 = 5593^2 + 562^2 .

It is an emirp because it is prime and its reverse (39479513) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31597493 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31597493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31597453) 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, 15798746 + 15798747.

It is an arithmetic number, because the mean of its divisors is an integer number (15798747).

Almost surely, 2^31597493 is an apocalyptic number.

It is an amenable number.

31597493 is a deficient number, since it is larger than the sum of its proper divisors (1).

31597493 is an equidigital number, since it uses as much as digits as its factorization.

31597493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 102060, while the sum is 41.

The square root of 31597493 is about 5621.1647369562. The cubic root of 31597493 is about 316.1434648733.

The spelling of 31597493 in words is "thirty-one million, five hundred ninety-seven thousand, four hundred ninety-three".