31664497 has 2 divisors, whose sum is σ = 31664498. Its totient is φ = 31664496.

The previous prime is 31664483. The next prime is 31664513. The reversal of 31664497 is 79446613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31315216 + 349281 = 5596^2 + 591^2 .

It is an emirp because it is prime and its reverse (79446613) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31664497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31664447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15832248 + 15832249.

It is an arithmetic number, because the mean of its divisors is an integer number (15832249).

Almost surely, 2^31664497 is an apocalyptic number.

It is an amenable number.

31664497 is a deficient number, since it is larger than the sum of its proper divisors (1).

31664497 is an equidigital number, since it uses as much as digits as its factorization.

31664497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 40.

The square root of 31664497 is about 5627.1215554669. The cubic root of 31664497 is about 316.3667728979.

The spelling of 31664497 in words is "thirty-one million, six hundred sixty-four thousand, four hundred ninety-seven".