129531096225 has 144 divisors (see below), whose sum is σ = 246340036800. Its totient is φ = 64950197760.

The previous prime is 129531096217. The next prime is 129531096257. The reversal of 129531096225 is 522690135921.

129531096225 is a `hidden beast` number, since 1 + 2 + 9 + 5 + 3 + 10 + 9 + 622 + 5 = 666.

It is not a de Polignac number, because 129531096225 - 2³ = 129531096217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 142812222 + ... + 142813128.

It is an arithmetic number, because the mean of its divisors is an integer number (1710694700).

Almost surely, 2^129531096225 is an apocalyptic number.

129531096225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129531096225 is a deficient number, since it is larger than the sum of its proper divisors (116808940575).

129531096225 is a wasteful number, since it uses less digits than its factorization.

129531096225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1504 (or 1496 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The spelling of 129531096225 in words is "one hundred twenty-nine billion, five hundred thirty-one million, ninety-six thousand, two hundred twenty-five".