129367891 has 8 divisors (see below), whose sum is σ = 130819104. Its totient is φ = 127924800.

The previous prime is 129367883. The next prime is 129367919. The reversal of 129367891 is 198763921.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129367891 - 2³ = 129367883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129367831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33345 + ... + 37021.

It is an arithmetic number, because the mean of its divisors is an integer number (16352388).

Almost surely, 2^129367891 is an apocalyptic number.

129367891 is a deficient number, since it is larger than the sum of its proper divisors (1451213).

129367891 is a wasteful number, since it uses less digits than its factorization.

129367891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4061.

The product of its digits is 163296, while the sum is 46.

The square root of 129367891 is about 11374.0006593986. Note that the first 3 decimals coincide. The cubic root of 129367891 is about 505.7573070510.

The spelling of 129367891 in words is "one hundred twenty-nine million, three hundred sixty-seven thousand, eight hundred ninety-one".