15505625 has 10 divisors (see below), whose sum is σ = 19376610. Its totient is φ = 12404000.

The previous prime is 15505597. The next prime is 15505639. The reversal of 15505625 is 52650551.

It can be written as a sum of positive squares in 5 ways, for example, as 3087049 + 12418576 = 1757^2 + 3524^2 .

It is not a de Polignac number, because 15505625 - 2⁶ = 15505561 is a prime.

It is a Curzon number.

It is a congruent 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 9 ways as a sum of consecutive naturals, for example, 11780 + ... + 13029.

It is an arithmetic number, because the mean of its divisors is an integer number (1937661).

Almost surely, 2^15505625 is an apocalyptic number.

It is an amenable number.

15505625 is a deficient number, since it is larger than the sum of its proper divisors (3870985).

15505625 is an frugal number, since it uses more digits than its factorization.

15505625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24829 (or 24814 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 29.

The square root of 15505625 is about 3937.7182479197. The cubic root of 15505625 is about 249.3617050385.

The spelling of 15505625 in words is "fifteen million, five hundred five thousand, six hundred twenty-five".