129905575 has 6 divisors (see below), whose sum is σ = 161082944. Its totient is φ = 103924440.

The previous prime is 129905519. The next prime is 129905599. The reversal of 129905575 is 575509921.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-129905575 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2598087 + ... + 2598136.

Almost surely, 2^129905575 is an apocalyptic number.

129905575 is a deficient number, since it is larger than the sum of its proper divisors (31177369).

129905575 is an equidigital number, since it uses as much as digits as its factorization.

129905575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5196233 (or 5196228 counting only the distinct ones).

The product of its (nonzero) digits is 141750, while the sum is 43.

The square root of 129905575 is about 11397.6126886291. The cubic root of 129905575 is about 506.4570214631.

The spelling of 129905575 in words is "one hundred twenty-nine million, nine hundred five thousand, five hundred seventy-five".