129816131 has 16 divisors (see below), whose sum is σ = 139799520. Its totient is φ = 120115200.

The previous prime is 129816109. The next prime is 129816139. The reversal of 129816131 is 131618921.

It is a de Polignac number, because none of the positive numbers 2^k-129816131 is a prime.

It is a super-2 number, since 2×129816131² = 33704455735618322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129816139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 323531 + ... + 323931.

It is an arithmetic number, because the mean of its divisors is an integer number (8737470).

Almost surely, 2^129816131 is an apocalyptic number.

129816131 is a deficient number, since it is larger than the sum of its proper divisors (9983389).

129816131 is a wasteful number, since it uses less digits than its factorization.

129816131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694.

The product of its digits is 2592, while the sum is 32.

The square root of 129816131 is about 11393.6882088286. The cubic root of 129816131 is about 506.3407576756.

The spelling of 129816131 in words is "one hundred twenty-nine million, eight hundred sixteen thousand, one hundred thirty-one".