15491536225 has 81 divisors (see below), whose sum is σ = 22120633017. Its totient is φ = 10753776000.

The previous prime is 15491536213. The next prime is 15491536241. The reversal of 15491536225 is 52263519451.

The square root of 15491536225 is 124465.

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

It can be written as a sum of positive squares in 4 ways, for example, as 84768849 + 15406767376 = 9207^2 + 124124^2 .

It is a de Polignac number, because none of the positive numbers 2^k-15491536225 is a prime.

It is a super-3 number, since 3×15491536225³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Its product of digits (324000) is a multiple of the sum of its prime divisors (120).

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 212212789 + ... + 212212861.

Almost surely, 2^15491536225 is an apocalyptic number.

15491536225 is the 124465-th square number.

15491536225 is the 62233-rd centered octagonal number.

It is an amenable number.

15491536225 is a deficient number, since it is larger than the sum of its proper divisors (6629096792).

15491536225 is an equidigital number, since it uses as much as digits as its factorization.

15491536225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240 (or 120 counting only the distinct ones).

The product of its digits is 324000, while the sum is 43.

The spelling of 15491536225 in words is "fifteen billion, four hundred ninety-one million, five hundred thirty-six thousand, two hundred twenty-five".