31113889 has 2 divisors, whose sum is σ = 31113890. Its totient is φ = 31113888.

The previous prime is 31113883. The next prime is 31113911. The reversal of 31113889 is 98831113.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29593600 + 1520289 = 5440^2 + 1233^2 .

It is an emirp because it is prime and its reverse (98831113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31113889 - 2³ = 31113881 is a prime.

It is not a weakly prime, because it can be changed into another prime (31113881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15556944 + 15556945.

It is an arithmetic number, because the mean of its divisors is an integer number (15556945).

Almost surely, 2^31113889 is an apocalyptic number.

It is an amenable number.

31113889 is a deficient number, since it is larger than the sum of its proper divisors (1).

31113889 is an equidigital number, since it uses as much as digits as its factorization.

31113889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 34.

The square root of 31113889 is about 5577.9825205893. The cubic root of 31113889 is about 314.5222926209.

The spelling of 31113889 in words is "thirty-one million, one hundred thirteen thousand, eight hundred eighty-nine".