125664129 has 20 divisors (see below), whose sum is σ = 188022384. Its totient is φ = 83641464.

The previous prime is 125664089. The next prime is 125664167. The reversal of 125664129 is 921466521.

125664129 is a `hidden beast` number, since 1 + 2 + 5 + 6 + 641 + 2 + 9 = 666.

It is not a de Polignac number, because 125664129 - 2¹⁵ = 125631361 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 125664093 and 125664102.

It is not an unprimeable number, because it can be changed into a prime (125664199) 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 in 19 ways as a sum of consecutive naturals, for example, 95494 + ... + 96800.

Almost surely, 2^125664129 is an apocalyptic number.

It is an amenable number.

125664129 is a deficient number, since it is larger than the sum of its proper divisors (62358255).

125664129 is a wasteful number, since it uses less digits than its factorization.

125664129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2506 (or 2497 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 125664129 is about 11210.0012934879. The cubic root of 125664129 is about 500.8839417066.

The spelling of 125664129 in words is "one hundred twenty-five million, six hundred sixty-four thousand, one hundred twenty-nine".