31608697 has 2 divisors, whose sum is σ = 31608698. Its totient is φ = 31608696.

The previous prime is 31608667. The next prime is 31608713. The reversal of 31608697 is 79680613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26020201 + 5588496 = 5101^2 + 2364^2 .

It is an emirp because it is prime and its reverse (79680613) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31608697 is a prime.

It is not a weakly prime, because it can be changed into another prime (31608667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15804348 + 15804349.

It is an arithmetic number, because the mean of its divisors is an integer number (15804349).

Almost surely, 2^31608697 is an apocalyptic number.

It is an amenable number.

31608697 is a deficient number, since it is larger than the sum of its proper divisors (1).

31608697 is an equidigital number, since it uses as much as digits as its factorization.

31608697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 31608697 is about 5622.1612392389. The cubic root of 31608697 is about 316.1808270442.

Adding to 31608697 its product of nonzero digits (54432), we get a square (31663129 = 5627²).

The spelling of 31608697 in words is "thirty-one million, six hundred eight thousand, six hundred ninety-seven".