215307313 has 4 divisors (see below), whose sum is σ = 231869428. Its totient is φ = 198745200.

The previous prime is 215307299. The next prime is 215307341. The reversal of 215307313 is 313703512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17539344 + 197767969 = 4188^2 + 14063^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215307313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215307383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8281038 + ... + 8281063.

It is an arithmetic number, because the mean of its divisors is an integer number (57967357).

Almost surely, 2^215307313 is an apocalyptic number.

It is an amenable number.

215307313 is a deficient number, since it is larger than the sum of its proper divisors (16562115).

215307313 is a wasteful number, since it uses less digits than its factorization.

215307313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16562114.

The product of its (nonzero) digits is 1890, while the sum is 25.

The square root of 215307313 is about 14673.3538429358. The cubic root of 215307313 is about 599.3579363169.

The spelling of 215307313 in words is "two hundred fifteen million, three hundred seven thousand, three hundred thirteen".