31923589 has 2 divisors, whose sum is σ = 31923590. Its totient is φ = 31923588.

The previous prime is 31923581. The next prime is 31923599. The reversal of 31923589 is 98532913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31922500 + 1089 = 5650^2 + 33^2 .

It is an emirp because it is prime and its reverse (98532913) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31923589 - 2³ = 31923581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31923581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15961794 + 15961795.

It is an arithmetic number, because the mean of its divisors is an integer number (15961795).

Almost surely, 2^31923589 is an apocalyptic number.

It is an amenable number.

31923589 is a deficient number, since it is larger than the sum of its proper divisors (1).

31923589 is an equidigital number, since it uses as much as digits as its factorization.

31923589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 40.

The square root of 31923589 is about 5650.0963708595. The cubic root of 31923589 is about 317.2273112801.

The spelling of 31923589 in words is "thirty-one million, nine hundred twenty-three thousand, five hundred eighty-nine".