129857199 has 4 divisors (see below), whose sum is σ = 173142936. Its totient is φ = 86571464.

The previous prime is 129857197. The next prime is 129857213. The reversal of 129857199 is 991758921.

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 129857199 - 2¹ = 129857197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129857197) 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, 21642864 + ... + 21642869.

It is an arithmetic number, because the mean of its divisors is an integer number (43285734).

Almost surely, 2^129857199 is an apocalyptic number.

129857199 is a deficient number, since it is larger than the sum of its proper divisors (43285737).

129857199 is an equidigital number, since it uses as much as digits as its factorization.

129857199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43285736.

The product of its digits is 408240, while the sum is 51.

The square root of 129857199 is about 11395.4902922165. The cubic root of 129857199 is about 506.3941465460.

The spelling of 129857199 in words is "one hundred twenty-nine million, eight hundred fifty-seven thousand, one hundred ninety-nine".