129376931 has 4 divisors (see below), whose sum is σ = 129575712. Its totient is φ = 129178152.

The previous prime is 129376921. The next prime is 129376939. The reversal of 129376931 is 139673921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129376931 - 2¹⁰ = 129375907 is a prime.

It is a super-2 number, since 2×129376931² = 33476780549957522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129376939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98411 + ... + 99716.

It is an arithmetic number, because the mean of its divisors is an integer number (32393928).

Almost surely, 2^129376931 is an apocalyptic number.

129376931 is a deficient number, since it is larger than the sum of its proper divisors (198781).

129376931 is an equidigital number, since it uses as much as digits as its factorization.

129376931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198780.

The product of its digits is 61236, while the sum is 41.

The square root of 129376931 is about 11374.3980500069. The cubic root of 129376931 is about 505.7690872527.

The spelling of 129376931 in words is "one hundred twenty-nine million, three hundred seventy-six thousand, nine hundred thirty-one".