219161225 has 6 divisors (see below), whose sum is σ = 271759950. Its totient is φ = 175328960.

The previous prime is 219161209. The next prime is 219161279. The reversal of 219161225 is 522161912.

It can be written as a sum of positive squares in 3 ways, for example, as 2809 + 219158416 = 53^2 + 14804^2 .

It is not a de Polignac number, because 219161225 - 2⁴ = 219161209 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4383200 + ... + 4383249.

It is an arithmetic number, because the mean of its divisors is an integer number (45293325).

Almost surely, 2^219161225 is an apocalyptic number.

219161225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

219161225 is a deficient number, since it is larger than the sum of its proper divisors (52598725).

219161225 is an equidigital number, since it uses as much as digits as its factorization.

219161225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8766459 (or 8766454 counting only the distinct ones).

The product of its digits is 2160, while the sum is 29.

The square root of 219161225 is about 14804.0948727033. The cubic root of 219161225 is about 602.9128956979.

The spelling of 219161225 in words is "two hundred nineteen million, one hundred sixty-one thousand, two hundred twenty-five".