125171989 has 2 divisors, whose sum is σ = 125171990. Its totient is φ = 125171988.

The previous prime is 125171947. The next prime is 125172023. The reversal of 125171989 is 989171521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78180964 + 46991025 = 8842^2 + 6855^2 .

It is a cyclic number.

It is not a de Polignac number, because 125171989 - 2²⁵ = 91617557 is a prime.

It is a super-2 number, since 2×125171989² = 31336053660432242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125171089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62585994 + 62585995.

It is an arithmetic number, because the mean of its divisors is an integer number (62585995).

Almost surely, 2^125171989 is an apocalyptic number.

It is an amenable number.

125171989 is a deficient number, since it is larger than the sum of its proper divisors (1).

125171989 is an equidigital number, since it uses as much as digits as its factorization.

125171989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 43.

The square root of 125171989 is about 11188.0288254902. The cubic root of 125171989 is about 500.2292135729.

The spelling of 125171989 in words is "one hundred twenty-five million, one hundred seventy-one thousand, nine hundred eighty-nine".