31697089 has 2 divisors, whose sum is σ = 31697090. Its totient is φ = 31697088.

The previous prime is 31697069. The next prime is 31697131. The reversal of 31697089 is 98079613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30991489 + 705600 = 5567^2 + 840^2 .

It is a cyclic number.

It is not a de Polignac number, because 31697089 - 2⁷ = 31696961 is a prime.

It is not a weakly prime, because it can be changed into another prime (31697069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15848544 + 15848545.

It is an arithmetic number, because the mean of its divisors is an integer number (15848545).

Almost surely, 2^31697089 is an apocalyptic number.

It is an amenable number.

31697089 is a deficient number, since it is larger than the sum of its proper divisors (1).

31697089 is an equidigital number, since it uses as much as digits as its factorization.

31697089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 31697089 is about 5630.0167850549. The cubic root of 31697089 is about 316.4752802292.

The spelling of 31697089 in words is "thirty-one million, six hundred ninety-seven thousand, eighty-nine".