215225 has 6 divisors (see below), whose sum is σ = 266910. Its totient is φ = 172160.

The previous prime is 215197. The next prime is 215239. The reversal of 215225 is 522512.

215225 = 12² + 13² + ... + 86².

215225 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 3 ways, for example, as 2704 + 212521 = 52^2 + 461^2 .

It is not a de Polignac number, because 215225 - 2⁶ = 215161 is a prime.

It is a plaindrome in base 11.

It is a congruent number.

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, 4280 + ... + 4329.

It is an arithmetic number, because the mean of its divisors is an integer number (44485).

2²¹⁵²²⁵ is an apocalyptic number.

215225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215225 is a deficient number, since it is larger than the sum of its proper divisors (51685).

215225 is an equidigital number, since it uses as much as digits as its factorization.

215225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8619 (or 8614 counting only the distinct ones).

The product of its digits is 200, while the sum is 17.

The square root of 215225 is about 463.9234850705. The cubic root of 215225 is about 59.9281547461.

Adding to 215225 its reverse (522512), we get a palindrome (737737).

The spelling of 215225 in words is "two hundred fifteen thousand, two hundred twenty-five".