129109625 has 16 divisors (see below), whose sum is σ = 163347600. Its totient is φ = 101865600.

The previous prime is 129109583. The next prime is 129109627. The reversal of 129109625 is 526901921.

It can be written as a sum of positive squares in 8 ways, for example, as 11669056 + 117440569 = 3416^2 + 10837^2 .

It is not a de Polignac number, because 129109625 - 2¹⁴ = 129093241 is a prime.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (129109627) 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, 2051 + ... + 16199.

It is an arithmetic number, because the mean of its divisors is an integer number (10209225).

Almost surely, 2^129109625 is an apocalyptic number.

It is an amenable number.

129109625 is a deficient number, since it is larger than the sum of its proper divisors (34237975).

129109625 is an equidigital number, since it uses as much as digits as its factorization.

129109625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14237 (or 14227 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 129109625 is about 11362.6416382811. The cubic root of 129109625 is about 505.4205234951.

The spelling of 129109625 in words is "one hundred twenty-nine million, one hundred nine thousand, six hundred twenty-five".