125855129 has 2 divisors, whose sum is σ = 125855130. Its totient is φ = 125855128.

The previous prime is 125855113. The next prime is 125855153. The reversal of 125855129 is 921558521.

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., 102313225 + 23541904 = 10115^2 + 4852^2 .

It is a cyclic number.

It is not a de Polignac number, because 125855129 - 2⁴ = 125855113 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 125855092 and 125855101.

It is not a weakly prime, because it can be changed into another prime (125855159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62927564 + 62927565.

It is an arithmetic number, because the mean of its divisors is an integer number (62927565).

Almost surely, 2^125855129 is an apocalyptic number.

It is an amenable number.

125855129 is a deficient number, since it is larger than the sum of its proper divisors (1).

125855129 is an equidigital number, since it uses as much as digits as its factorization.

125855129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36000, while the sum is 38.

The square root of 125855129 is about 11218.5172371397. The cubic root of 125855129 is about 501.1375818522.

The spelling of 125855129 in words is "one hundred twenty-five million, eight hundred fifty-five thousand, one hundred twenty-nine".