129745891 has 8 divisors (see below), whose sum is σ = 143132400. Its totient is φ = 116624640.

The previous prime is 129745883. The next prime is 129745901. The reversal of 129745891 is 198547921.

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

It is not a de Polignac number, because 129745891 - 2³ = 129745883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129745871) 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, 65286 + ... + 67243.

It is an arithmetic number, because the mean of its divisors is an integer number (17891550).

Almost surely, 2^129745891 is an apocalyptic number.

129745891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

129745891 is a deficient number, since it is larger than the sum of its proper divisors (13386509).

129745891 is a wasteful number, since it uses less digits than its factorization.

129745891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132629.

The product of its digits is 181440, while the sum is 46.

The square root of 129745891 is about 11390.6053833850. The cubic root of 129745891 is about 506.2494187668.

The spelling of 129745891 in words is "one hundred twenty-nine million, seven hundred forty-five thousand, eight hundred ninety-one".