129125379 has 4 divisors (see below), whose sum is σ = 172167176. Its totient is φ = 86083584.

The previous prime is 129125351. The next prime is 129125407. The reversal of 129125379 is 973521921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 973521921 = 3 ⋅324507307.

It is an interprime number because it is at equal distance from previous prime (129125351) and next prime (129125407).

It is not a de Polignac number, because 129125379 - 2⁸ = 129125123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129125179) 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, 21520894 + ... + 21520899.

It is an arithmetic number, because the mean of its divisors is an integer number (43041794).

Almost surely, 2^129125379 is an apocalyptic number.

129125379 is a deficient number, since it is larger than the sum of its proper divisors (43041797).

129125379 is an equidigital number, since it uses as much as digits as its factorization.

129125379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43041796.

The product of its digits is 34020, while the sum is 39.

The square root of 129125379 is about 11363.3348538182. The cubic root of 129125379 is about 505.4410798533.

The spelling of 129125379 in words is "one hundred twenty-nine million, one hundred twenty-five thousand, three hundred seventy-nine".