129397025 has 12 divisors (see below), whose sum is σ = 164367084. Its totient is φ = 100992000.

The previous prime is 129397001. The next prime is 129397027. The reversal of 129397025 is 520793921.

It can be written as a sum of positive squares in 6 ways, for example, as 53567761 + 75829264 = 7319^2 + 8708^2 .

It is not a de Polignac number, because 129397025 - 2¹² = 129392929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129397025.

It is not an unprimeable number, because it can be changed into a prime (129397027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62096 + ... + 64145.

It is an arithmetic number, because the mean of its divisors is an integer number (13697257).

Almost surely, 2^129397025 is an apocalyptic number.

It is an amenable number.

129397025 is a deficient number, since it is larger than the sum of its proper divisors (34970059).

129397025 is a wasteful number, since it uses less digits than its factorization.

129397025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126292 (or 126287 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 129397025 is about 11375.2813152027. The cubic root of 129397025 is about 505.7952701738.

The spelling of 129397025 in words is "one hundred twenty-nine million, three hundred ninety-seven thousand, twenty-five".