129113925 has 24 divisors (see below), whose sum is σ = 213992256. Its totient is φ = 68691840.

The previous prime is 129113923. The next prime is 129113947. The reversal of 129113925 is 529311921.

It is not a de Polignac number, because 129113925 - 2¹ = 129113923 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129113923) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32392 + ... + 36158.

It is an arithmetic number, because the mean of its divisors is an integer number (8916344).

Almost surely, 2^129113925 is an apocalyptic number.

129113925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129113925 is a deficient number, since it is larger than the sum of its proper divisors (84878331).

129113925 is a wasteful number, since it uses less digits than its factorization.

129113925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4237 (or 4232 counting only the distinct ones).

The product of its digits is 4860, while the sum is 33.

The square root of 129113925 is about 11362.8308532689. The cubic root of 129113925 is about 505.4261344481.

It can be divided in two parts, 12911 and 3925, that added together give a triangular number (16836 = T₁₈₃).

The spelling of 129113925 in words is "one hundred twenty-nine million, one hundred thirteen thousand, nine hundred twenty-five".