215307245 has 12 divisors (see below), whose sum is σ = 266977980. Its totient is φ = 166685760.

The previous prime is 215307203. The next prime is 215307251. The reversal of 215307245 is 542703512.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 115047076 + 100260169 = 10726^2 + 10013^2 .

It is a de Polignac number, because none of the positive numbers 2^k-215307245 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17600 + ... + 27209.

It is an arithmetic number, because the mean of its divisors is an integer number (22248165).

Almost surely, 2^215307245 is an apocalyptic number.

It is an amenable number.

215307245 is a deficient number, since it is larger than the sum of its proper divisors (51670735).

215307245 is an equidigital number, since it uses as much as digits as its factorization.

215307245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44876 (or 44845 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 215307245 is about 14673.3515258103. The cubic root of 215307245 is about 599.3578732190.

The spelling of 215307245 in words is "two hundred fifteen million, three hundred seven thousand, two hundred forty-five".