129209051 has 4 divisors (see below), whose sum is σ = 130979112. Its totient is φ = 127438992.

The previous prime is 129208967. The next prime is 129209057. The reversal of 129209051 is 150902921.

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 129209051 - 2²⁶ = 62100187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129209057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 884921 + ... + 885066.

It is an arithmetic number, because the mean of its divisors is an integer number (32744778).

Almost surely, 2^129209051 is an apocalyptic number.

129209051 is a deficient number, since it is larger than the sum of its proper divisors (1770061).

129209051 is an equidigital number, since it uses as much as digits as its factorization.

129209051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770060.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 129209051 is about 11367.0159232756. The cubic root of 129209051 is about 505.5502299286.

The spelling of 129209051 in words is "one hundred twenty-nine million, two hundred nine thousand, fifty-one".