15561625 has 8 divisors (see below), whose sum is σ = 19421064. Its totient is φ = 12449200.

The previous prime is 15561619. The next prime is 15561631. The reversal of 15561625 is 52616551.

It is an interprime number because it is at equal distance from previous prime (15561619) and next prime (15561631).

It can be written as a sum of positive squares in 4 ways, for example, as 839056 + 14722569 = 916^2 + 3837^2 .

It is not a de Polignac number, because 15561625 - 2³ = 15561617 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62122 + ... + 62371.

It is an arithmetic number, because the mean of its divisors is an integer number (2427633).

Almost surely, 2^15561625 is an apocalyptic number.

It is an amenable number.

15561625 is a deficient number, since it is larger than the sum of its proper divisors (3859439).

15561625 is an equidigital number, since it uses as much as digits as its factorization.

15561625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124508 (or 124498 counting only the distinct ones).

The product of its digits is 9000, while the sum is 31.

The square root of 15561625 is about 3944.8225562121. The cubic root of 15561625 is about 249.6615419915.

The spelling of 15561625 in words is "fifteen million, five hundred sixty-one thousand, six hundred twenty-five".