129312999 has 12 divisors (see below), whose sum is σ = 197773056. Its totient is φ = 81137472.

The previous prime is 129312991. The next prime is 129313007. The reversal of 129312999 is 999213921.

It is an interprime number because it is at equal distance from previous prime (129312991) and next prime (129313007).

It is not a de Polignac number, because 129312999 - 2³ = 129312991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129312991) 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, 422439 + ... + 422744.

It is an arithmetic number, because the mean of its divisors is an integer number (16481088).

Almost surely, 2^129312999 is an apocalyptic number.

129312999 is a deficient number, since it is larger than the sum of its proper divisors (68460057).

129312999 is a wasteful number, since it uses less digits than its factorization.

129312999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845206 (or 845203 counting only the distinct ones).

The product of its digits is 78732, while the sum is 45.

The square root of 129312999 is about 11371.5873562137. The cubic root of 129312999 is about 505.6857644207.

The spelling of 129312999 in words is "one hundred twenty-nine million, three hundred twelve thousand, nine hundred ninety-nine".