215317 has 2 divisors, whose sum is σ = 215318. Its totient is φ = 215316.

The previous prime is 215309. The next prime is 215329. The reversal of 215317 is 713512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128881 + 86436 = 359^2 + 294^2 .

It is a cyclic number.

It is not a de Polignac number, because 215317 - 2³ = 215309 is a prime.

It is a super-2 number, since 2×215317² = 92722820978, which contains 22 as substring.

215317 is a lucky number.

It is equal to p₁₉₂₃₄ and since 215317 and 19234 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 215294 and 215303.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107658 + 107659.

It is an arithmetic number, because the mean of its divisors is an integer number (107659).

2²¹⁵³¹⁷ is an apocalyptic number.

It is an amenable number.

215317 is a deficient number, since it is larger than the sum of its proper divisors (1).

215317 is an equidigital number, since it uses as much as digits as its factorization.

215317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 210, while the sum is 19.

The square root of 215317 is about 464.0226287586. The cubic root of 215317 is about 59.9366924854.

Adding to 215317 its reverse (713512), we get a palindrome (928829).

The spelling of 215317 in words is "two hundred fifteen thousand, three hundred seventeen".