31189057 has 2 divisors, whose sum is σ = 31189058. Its totient is φ = 31189056.

The previous prime is 31189049. The next prime is 31189073. The reversal of 31189057 is 75098113.

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., 16451136 + 14737921 = 4056^2 + 3839^2 .

It is a cyclic number.

It is not a de Polignac number, because 31189057 - 2³ = 31189049 is a prime.

It is not a weakly prime, because it can be changed into another prime (31189097) 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, 15594528 + 15594529.

It is an arithmetic number, because the mean of its divisors is an integer number (15594529).

Almost surely, 2^31189057 is an apocalyptic number.

It is an amenable number.

31189057 is a deficient number, since it is larger than the sum of its proper divisors (1).

31189057 is an equidigital number, since it uses as much as digits as its factorization.

31189057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 31189057 is about 5584.7163759675. The cubic root of 31189057 is about 314.7753735767.

The spelling of 31189057 in words is "thirty-one million, one hundred eighty-nine thousand, fifty-seven".