31696589 has 2 divisors, whose sum is σ = 31696590. Its totient is φ = 31696588.

The previous prime is 31696559. The next prime is 31696591. The reversal of 31696589 is 98569613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23687689 + 8008900 = 4867^2 + 2830^2 .

It is an emirp because it is prime and its reverse (98569613) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31696589 is a prime.

It is a Sophie Germain prime.

Together with 31696591, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31696559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15848294 + 15848295.

It is an arithmetic number, because the mean of its divisors is an integer number (15848295).

Almost surely, 2^31696589 is an apocalyptic number.

It is an amenable number.

31696589 is a deficient number, since it is larger than the sum of its proper divisors (1).

31696589 is an equidigital number, since it uses as much as digits as its factorization.

31696589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 47.

The square root of 31696589 is about 5629.9723800388. The cubic root of 31696589 is about 316.4736161597.

The spelling of 31696589 in words is "thirty-one million, six hundred ninety-six thousand, five hundred eighty-nine".