125531985889 has 2 divisors, whose sum is σ = 125531985890. Its totient is φ = 125531985888.

The previous prime is 125531985883. The next prime is 125531985911. The reversal of 125531985889 is 988589135521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125451972864 + 80013025 = 354192^2 + 8945^2 .

It is a cyclic number.

It is not a de Polignac number, because 125531985889 - 2⁵ = 125531985857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 125531985889.

It is not a weakly prime, because it can be changed into another prime (125531985883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62765992944 + 62765992945.

It is an arithmetic number, because the mean of its divisors is an integer number (62765992945).

Almost surely, 2^125531985889 is an apocalyptic number.

It is an amenable number.

125531985889 is a deficient number, since it is larger than the sum of its proper divisors (1).

125531985889 is an equidigital number, since it uses as much as digits as its factorization.

125531985889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104000, while the sum is 64.

The spelling of 125531985889 in words is "one hundred twenty-five billion, five hundred thirty-one million, nine hundred eighty-five thousand, eight hundred eighty-nine".