215134225 has 6 divisors (see below), whose sum is σ = 266766470. Its totient is φ = 172107360.

The previous prime is 215134217. The next prime is 215134229. The reversal of 215134225 is 522431512.

It can be written as a sum of positive squares in 3 ways, for example, as 2178576 + 212955649 = 1476^2 + 14593^2 .

It is not a de Polignac number, because 215134225 - 2³ = 215134217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 8605369 = 215134225 / (2 + 1 + 5 + 1 + 3 + 4 + 2 + 2 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 215134225.

It is not an unprimeable number, because it can be changed into a prime (215134229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4302660 + ... + 4302709.

Almost surely, 2^215134225 is an apocalyptic number.

215134225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215134225 is a deficient number, since it is larger than the sum of its proper divisors (51632245).

215134225 is an equidigital number, since it uses as much as digits as its factorization.

215134225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8605379 (or 8605374 counting only the distinct ones).

The product of its digits is 2400, while the sum is 25.

The square root of 215134225 is about 14667.4546189855. The cubic root of 215134225 is about 599.1972830362.

Adding to 215134225 its reverse (522431512), we get a palindrome (737565737).

The spelling of 215134225 in words is "two hundred fifteen million, one hundred thirty-four thousand, two hundred twenty-five".