215315225 has 12 divisors (see below), whose sum is σ = 272673024. Its totient is φ = 168586320.

The previous prime is 215315209. The next prime is 215315237. The reversal of 215315225 is 522513512.

It is not a de Polignac number, because 215315225 - 2⁴ = 215315209 is a prime.

It is a super-2 number, since 2×215315225² = 92721292233601250, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215315194 and 215315203.

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, 90449 + ... + 92798.

It is an arithmetic number, because the mean of its divisors is an integer number (22722752).

Almost surely, 2^215315225 is an apocalyptic number.

215315225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215315225 is a deficient number, since it is larger than the sum of its proper divisors (57357799).

215315225 is a wasteful number, since it uses less digits than its factorization.

215315225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183304 (or 183299 counting only the distinct ones).

The product of its digits is 3000, while the sum is 26.

The square root of 215315225 is about 14673.6234448074. The cubic root of 215315225 is about 599.3652778572.

Adding to 215315225 its reverse (522513512), we get a palindrome (737828737).

The spelling of 215315225 in words is "two hundred fifteen million, three hundred fifteen thousand, two hundred twenty-five".