215331313 has 16 divisors (see below), whose sum is σ = 238049280. Its totient is φ = 193867344.

The previous prime is 215331287. The next prime is 215331323. The reversal of 215331313 is 313133512.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 215331313 - 2¹⁷ = 215200241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215331323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69720 + ... + 72742.

It is an arithmetic number, because the mean of its divisors is an integer number (14878080).

Almost surely, 2^215331313 is an apocalyptic number.

215331313 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

215331313 is a deficient number, since it is larger than the sum of its proper divisors (22717967).

215331313 is a wasteful number, since it uses less digits than its factorization.

215331313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3228.

The product of its digits is 810, while the sum is 22.

The square root of 215331313 is about 14674.1716290903. The cubic root of 215331313 is about 599.3802053485.

Adding to 215331313 its reverse (313133512), we get a palindrome (528464825).

The spelling of 215331313 in words is "two hundred fifteen million, three hundred thirty-one thousand, three hundred thirteen".