125525309 has 16 divisors (see below), whose sum is σ = 157651200. Its totient is φ = 99313200.

The previous prime is 125525261. The next prime is 125525327. The reversal of 125525309 is 903525521.

It is a de Polignac number, because none of the positive numbers 2^k-125525309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125525339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9617 + ... + 18534.

It is an arithmetic number, because the mean of its divisors is an integer number (9853200).

Almost surely, 2^125525309 is an apocalyptic number.

It is an amenable number.

125525309 is a deficient number, since it is larger than the sum of its proper divisors (32125891).

125525309 is an equidigital number, since it uses as much as digits as its factorization.

125525309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28185 (or 28171 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 32.

The square root of 125525309 is about 11203.8077902113. The cubic root of 125525309 is about 500.6994331304.

The spelling of 125525309 in words is "one hundred twenty-five million, five hundred twenty-five thousand, three hundred nine".