129905001 has 12 divisors (see below), whose sum is σ = 189363460. Its totient is φ = 85808160.

The previous prime is 129904997. The next prime is 129905003. The reversal of 129905001 is 100509921.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 42968025 + 86936976 = 6555^2 + 9324^2 .

It is not a de Polignac number, because 129905001 - 2² = 129904997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129905003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65230 + ... + 67191.

Almost surely, 2^129905001 is an apocalyptic number.

It is an amenable number.

129905001 is a deficient number, since it is larger than the sum of its proper divisors (59458459).

129905001 is a wasteful number, since it uses less digits than its factorization.

129905001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132536 (or 132533 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 129905001 is about 11397.5875078896. The cubic root of 129905001 is about 506.4562755193.

The spelling of 129905001 in words is "one hundred twenty-nine million, nine hundred five thousand, one".