11217987225 has 81 divisors (see below), whose sum is σ = 21072878463. Its totient is φ = 5704158240.

The previous prime is 11217987203. The next prime is 11217987229. The reversal of 11217987225 is 52278971211.

The square root of 11217987225 is 105915.

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

11217987225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 4038475401 + 7179511824 = 63549^2 + 84732^2 .

It is not a de Polignac number, because 11217987225 - 2⁷ = 11217987097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (11217987229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 36540522 + ... + 36540828.

Almost surely, 2^11217987225 is an apocalyptic number.

11217987225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11217987225 is the 105915-th square number.

11217987225 is the 52958-th centered octagonal number.

It is an amenable number.

11217987225 is a deficient number, since it is larger than the sum of its proper divisors (9854891238).

11217987225 is an equidigital number, since it uses as much as digits as its factorization.

11217987225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676 (or 338 counting only the distinct ones).

The product of its digits is 141120, while the sum is 45.

The spelling of 11217987225 in words is "eleven billion, two hundred seventeen million, nine hundred eighty-seven thousand, two hundred twenty-five".