215312313 has 12 divisors (see below), whose sum is σ = 302989488. Its totient is φ = 135986040.

The previous prime is 215312297. The next prime is 215312323. The reversal of 215312313 is 313213512.

It is not a de Polignac number, because 215312313 - 2⁴ = 215312297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 215312313.

It is not an unprimeable number, because it can be changed into a prime (215312323) by changing a digit.

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, 98323 + ... + 100488.

It is an arithmetic number, because the mean of its divisors is an integer number (25249124).

Almost surely, 2^215312313 is an apocalyptic number.

It is an amenable number.

215312313 is a deficient number, since it is larger than the sum of its proper divisors (87677175).

215312313 is a wasteful number, since it uses less digits than its factorization.

215312313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198852 (or 198833 counting only the distinct ones).

The product of its digits is 540, while the sum is 21.

The square root of 215312313 is about 14673.5242188099. The cubic root of 215312313 is about 599.3625758350.

Adding to 215312313 its reverse (313213512), we get a palindrome (528525825).

The spelling of 215312313 in words is "two hundred fifteen million, three hundred twelve thousand, three hundred thirteen".