31125889 has 2 divisors, whose sum is σ = 31125890. Its totient is φ = 31125888.

The previous prime is 31125883. The next prime is 31125901. The reversal of 31125889 is 98852113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18558864 + 12567025 = 4308^2 + 3545^2 .

It is a cyclic number.

It is not a de Polignac number, because 31125889 - 2⁹ = 31125377 is a prime.

It is not a weakly prime, because it can be changed into another prime (31125883) 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, 15562944 + 15562945.

It is an arithmetic number, because the mean of its divisors is an integer number (15562945).

Almost surely, 2^31125889 is an apocalyptic number.

It is an amenable number.

31125889 is a deficient number, since it is larger than the sum of its proper divisors (1).

31125889 is an equidigital number, since it uses as much as digits as its factorization.

31125889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 37.

The square root of 31125889 is about 5579.0580746216. The cubic root of 31125889 is about 314.5627223937.

The spelling of 31125889 in words is "thirty-one million, one hundred twenty-five thousand, eight hundred eighty-nine".