129185253 has 16 divisors (see below), whose sum is σ = 194010240. Its totient is φ = 84942432.

The previous prime is 129185249. The next prime is 129185269. The reversal of 129185253 is 352581921.

129185253 is a `hidden beast` number, since 129 + 1 + 8 + 525 + 3 = 666.

It is not a de Polignac number, because 129185253 - 2² = 129185249 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129185233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30801 + ... + 34742.

It is an arithmetic number, because the mean of its divisors is an integer number (12125640).

Almost surely, 2^129185253 is an apocalyptic number.

It is an amenable number.

129185253 is a deficient number, since it is larger than the sum of its proper divisors (64824987).

129185253 is an equidigital number, since it uses as much as digits as its factorization.

129185253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65625 (or 65619 counting only the distinct ones).

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

The square root of 129185253 is about 11365.9690743904. The cubic root of 129185253 is about 505.5191902479.

The spelling of 129185253 in words is "one hundred twenty-nine million, one hundred eighty-five thousand, two hundred fifty-three".