9218561225 has 12 divisors (see below), whose sum is σ = 11440731660. Its totient is φ = 7368580800.

The previous prime is 9218561203. The next prime is 9218561243. The reversal of 9218561225 is 5221658129.

It can be written as a sum of positive squares in 6 ways, for example, as 279993289 + 8938567936 = 16733^2 + 94544^2 .

It is not a de Polignac number, because 9218561225 - 2⁸ = 9218560969 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126590 + ... + 185639.

It is an arithmetic number, because the mean of its divisors is an integer number (953394305).

Almost surely, 2^9218561225 is an apocalyptic number.

It is an amenable number.

9218561225 is a deficient number, since it is larger than the sum of its proper divisors (2222170435).

9218561225 is a wasteful number, since it uses less digits than its factorization.

9218561225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313420 (or 313415 counting only the distinct ones).

The product of its digits is 86400, while the sum is 41.

The square root of 9218561225 is about 96013.3387868582. The cubic root of 9218561225 is about 2096.7873192637.

The spelling of 9218561225 in words is "nine billion, two hundred eighteen million, five hundred sixty-one thousand, two hundred twenty-five".