199937129 has 4 divisors (see below), whose sum is σ = 228499584. Its totient is φ = 171374676.

The previous prime is 199937063. The next prime is 199937141. The reversal of 199937129 is 921739991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 199937129 - 2¹² = 199933033 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (199937329) 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, 14281217 + ... + 14281230.

It is an arithmetic number, because the mean of its divisors is an integer number (57124896).

Almost surely, 2^199937129 is an apocalyptic number.

It is an amenable number.

199937129 is a deficient number, since it is larger than the sum of its proper divisors (28562455).

199937129 is an equidigital number, since it uses as much as digits as its factorization.

199937129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28562454.

The product of its digits is 275562, while the sum is 50.

The square root of 199937129 is about 14139.9126234924. The cubic root of 199937129 is about 584.7422625806.

The spelling of 199937129 in words is "one hundred ninety-nine million, nine hundred thirty-seven thousand, one hundred twenty-nine".