129118491 has 12 divisors (see below), whose sum is σ = 189666360. Its totient is φ = 84619680.

The previous prime is 129118489. The next prime is 129118511. The reversal of 129118491 is 194811921.

It is not a de Polignac number, because 129118491 - 2¹ = 129118489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129118421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121050 + ... + 122111.

It is an arithmetic number, because the mean of its divisors is an integer number (15805530).

Almost surely, 2^129118491 is an apocalyptic number.

129118491 is a deficient number, since it is larger than the sum of its proper divisors (60547869).

129118491 is a wasteful number, since it uses less digits than its factorization.

129118491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243226 (or 243223 counting only the distinct ones).

The product of its digits is 5184, while the sum is 36.

The square root of 129118491 is about 11363.0317697347. The cubic root of 129118491 is about 505.4320923610.

The spelling of 129118491 in words is "one hundred twenty-nine million, one hundred eighteen thousand, four hundred ninety-one".