129199369 has 4 divisors (see below), whose sum is σ = 139137796. Its totient is φ = 119260944.

The previous prime is 129199363. The next prime is 129199409. The reversal of 129199369 is 963991921.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16096144 + 113103225 = 4012^2 + 10635^2 .

It is a cyclic number.

It is not a de Polignac number, because 129199369 - 2³ = 129199361 is a prime.

It is a super-2 number, since 2×129199369² = 33384953899996322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129199361) 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, 4969194 + ... + 4969219.

It is an arithmetic number, because the mean of its divisors is an integer number (34784449).

Almost surely, 2^129199369 is an apocalyptic number.

It is an amenable number.

129199369 is a deficient number, since it is larger than the sum of its proper divisors (9938427).

129199369 is an equidigital number, since it uses as much as digits as its factorization.

129199369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9938426.

The product of its digits is 236196, while the sum is 49.

The square root of 129199369 is about 11366.5900339548. The cubic root of 129199369 is about 505.5376021766.

The spelling of 129199369 in words is "one hundred twenty-nine million, one hundred ninety-nine thousand, three hundred sixty-nine".