129538251 has 16 divisors (see below), whose sum is σ = 195993600. Its totient is φ = 84520584.

The previous prime is 129538237. The next prime is 129538289. The reversal of 129538251 is 152835921.

It is not a de Polignac number, because 129538251 - 2⁶ = 129538187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129538291) 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, 49771 + ... + 52308.

It is an arithmetic number, because the mean of its divisors is an integer number (12249600).

Almost surely, 2^129538251 is an apocalyptic number.

129538251 is a deficient number, since it is larger than the sum of its proper divisors (66455349).

129538251 is a wasteful number, since it uses less digits than its factorization.

129538251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102135 (or 102129 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 129538251 is about 11381.4872051064. The cubic root of 129538251 is about 505.9792143086.

The spelling of 129538251 in words is "one hundred twenty-nine million, five hundred thirty-eight thousand, two hundred fifty-one".