215315 has 4 divisors (see below), whose sum is σ = 258384. Its totient is φ = 172248.

The previous prime is 215309. The next prime is 215317. The reversal of 215315 is 513512.

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

It is a cyclic number.

It is not a de Polignac number, because 215315 - 2¹² = 211219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215293 and 215302.

It is not an unprimeable number, because it can be changed into a prime (215317) 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, 21527 + ... + 21536.

It is an arithmetic number, because the mean of its divisors is an integer number (64596).

2²¹⁵³¹⁵ is an apocalyptic number.

215315 is a deficient number, since it is larger than the sum of its proper divisors (43069).

215315 is an equidigital number, since it uses as much as digits as its factorization.

215315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43068.

The product of its digits is 150, while the sum is 17.

The square root of 215315 is about 464.0204736862. The cubic root of 215315 is about 59.9365069082.

Adding to 215315 its reverse (513512), we get a palindrome (728827).

The spelling of 215315 in words is "two hundred fifteen thousand, three hundred fifteen".