129899725 has 6 divisors (see below), whose sum is σ = 161075690. Its totient is φ = 103919760.

The previous prime is 129899647. The next prime is 129899773. The reversal of 129899725 is 527998921.

It can be written as a sum of positive squares in 3 ways, for example, as 20529961 + 109369764 = 4531^2 + 10458^2 .

It is not a de Polignac number, because 129899725 - 2⁹ = 129899213 is a prime.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 2597970 + ... + 2598019.

Almost surely, 2^129899725 is an apocalyptic number.

It is an amenable number.

129899725 is a deficient number, since it is larger than the sum of its proper divisors (31175965).

129899725 is an equidigital number, since it uses as much as digits as its factorization.

129899725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5195999 (or 5195994 counting only the distinct ones).

The product of its digits is 816480, while the sum is 52.

The square root of 129899725 is about 11397.3560530502. The cubic root of 129899725 is about 506.4494189717.

The spelling of 129899725 in words is "one hundred twenty-nine million, eight hundred ninety-nine thousand, seven hundred twenty-five".