129868931 has 12 divisors (see below), whose sum is σ = 135999600. Its totient is φ = 123866400.

The previous prime is 129868913. The next prime is 129868961. The reversal of 129868931 is 139868921.

It is not a de Polignac number, because 129868931 - 2⁶ = 129868867 is a prime.

It is a super-2 number, since 2×129868931² = 33731878478165522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129868961) 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, 295610 + ... + 296048.

It is an arithmetic number, because the mean of its divisors is an integer number (11333300).

Almost surely, 2^129868931 is an apocalyptic number.

129868931 is a deficient number, since it is larger than the sum of its proper divisors (6130669).

129868931 is an equidigital number, since it uses as much as digits as its factorization.

129868931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670 (or 569 counting only the distinct ones).

The product of its digits is 186624, while the sum is 47.

The square root of 129868931 is about 11396.0050456289. The cubic root of 129868931 is about 506.4093962133.

The spelling of 129868931 in words is "one hundred twenty-nine million, eight hundred sixty-eight thousand, nine hundred thirty-one".