31678897 has 2 divisors, whose sum is σ = 31678898. Its totient is φ = 31678896.

The previous prime is 31678879. The next prime is 31678943. The reversal of 31678897 is 79887613.

Together with previous prime (31678879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30958096 + 720801 = 5564^2 + 849^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31678897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31678897.

It is not a weakly prime, because it can be changed into another prime (31678847) 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, 15839448 + 15839449.

It is an arithmetic number, because the mean of its divisors is an integer number (15839449).

Almost surely, 2^31678897 is an apocalyptic number.

It is an amenable number.

31678897 is a deficient number, since it is larger than the sum of its proper divisors (1).

31678897 is an equidigital number, since it uses as much as digits as its factorization.

31678897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 49.

The square root of 31678897 is about 5628.4009274393. The cubic root of 31678897 is about 316.4147234581.

The spelling of 31678897 in words is "thirty-one million, six hundred seventy-eight thousand, eight hundred ninety-seven".