129899265 has 32 divisors (see below), whose sum is σ = 218263680. Its totient is φ = 65877504.

The previous prime is 129899251. The next prime is 129899279. The reversal of 129899265 is 562998921.

It is an interprime number because it is at equal distance from previous prime (129899251) and next prime (129899279).

It is not a de Polignac number, because 129899265 - 2⁴ = 129899249 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26917 + ... + 31373.

It is an arithmetic number, because the mean of its divisors is an integer number (6820740).

Almost surely, 2^129899265 is an apocalyptic number.

129899265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129899265 is a deficient number, since it is larger than the sum of its proper divisors (88364415).

129899265 is a wasteful number, since it uses less digits than its factorization.

129899265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4561.

The product of its digits is 699840, while the sum is 51.

The square root of 129899265 is about 11397.3358729135. The cubic root of 129899265 is about 506.4488211593.

The spelling of 129899265 in words is "one hundred twenty-nine million, eight hundred ninety-nine thousand, two hundred sixty-five".