215215313 has 4 divisors (see below), whose sum is σ = 215308980. Its totient is φ = 215121648.

The previous prime is 215215283. The next prime is 215215321. The reversal of 215215313 is 313512512.

It is a happy number.

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 14227984 + 200987329 = 3772^2 + 14177^2 .

It is a cyclic number.

It is not a de Polignac number, because 215215313 - 2⁸ = 215215057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215215373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43298 + ... + 48011.

It is an arithmetic number, because the mean of its divisors is an integer number (53827245).

Almost surely, 2^215215313 is an apocalyptic number.

It is an amenable number.

215215313 is a deficient number, since it is larger than the sum of its proper divisors (93667).

215215313 is an equidigital number, since it uses as much as digits as its factorization.

215215313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93666.

The product of its digits is 900, while the sum is 23.

The square root of 215215313 is about 14670.2185736955. The cubic root of 215215313 is about 599.2725563623.

Adding to 215215313 its reverse (313512512), we get a palindrome (528727825).

The spelling of 215215313 in words is "two hundred fifteen million, two hundred fifteen thousand, three hundred thirteen".