129390625 has 63 divisors (see below), whose sum is σ = 203727861. Its totient is φ = 81900000.

The previous prime is 129390619. The next prime is 129390641. The reversal of 129390625 is 526093921.

The square root of 129390625 is 11375.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 10 ways, for example, as 60699681 + 68690944 = 7791^2 + 8288^2 .

It is not a de Polignac number, because 129390625 - 2⁵ = 129390593 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 9953119 + ... + 9953131.

Almost surely, 2^129390625 is an apocalyptic number.

129390625 is the 11375-th square number.

129390625 is the 5688-th centered octagonal number.

It is an amenable number.

129390625 is a deficient number, since it is larger than the sum of its proper divisors (74337236).

129390625 is an frugal number, since it uses more digits than its factorization.

129390625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70 (or 25 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 37.

The cubic root of 129390625 is about 505.7869311282.

The spelling of 129390625 in words is "one hundred twenty-nine million, three hundred ninety thousand, six hundred twenty-five".