129731625 has 48 divisors (see below), whose sum is σ = 242581248. Its totient is φ = 69174000.

The previous prime is 129731611. The next prime is 129731627. The reversal of 129731625 is 526137921.

129731625 is a `hidden beast` number, since 1 + 29 + 7 + 3 + 1 + 625 = 666.

It is not a de Polignac number, because 129731625 - 2⁶ = 129731561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129731625.

It is not an unprimeable number, because it can be changed into a prime (129731627) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28240 + ... + 32510.

It is an arithmetic number, because the mean of its divisors is an integer number (5053776).

Almost surely, 2^129731625 is an apocalyptic number.

129731625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129731625 is a deficient number, since it is larger than the sum of its proper divisors (112849623).

129731625 is an frugal number, since it uses more digits than its factorization.

129731625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4301 (or 4279 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 129731625 is about 11389.9791483567. The cubic root of 129731625 is about 506.2308634742.

The spelling of 129731625 in words is "one hundred twenty-nine million, seven hundred thirty-one thousand, six hundred twenty-five".