215134541313217 has 2 divisors, whose sum is σ = 215134541313218. Its totient is φ = 215134541313216.

The previous prime is 215134541313163. The next prime is 215134541313253. The reversal of 215134541313217 is 712313145431512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133610689062081 + 81523852251136 = 11559009^2 + 9029056^2 .

It is a cyclic number.

It is not a de Polignac number, because 215134541313217 - 2¹⁹ = 215134540788929 is a prime.

It is not a weakly prime, because it can be changed into another prime (215134541313817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107567270656608 + 107567270656609.

It is an arithmetic number, because the mean of its divisors is an integer number (107567270656609).

Almost surely, 2^{215134541313217} is an apocalyptic number.

It is an amenable number.

215134541313217 is a deficient number, since it is larger than the sum of its proper divisors (1).

215134541313217 is an equidigital number, since it uses as much as digits as its factorization.

215134541313217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 302400, while the sum is 43.

Adding to 215134541313217 its reverse (712313145431512), we get a palindrome (927447686744729).

The spelling of 215134541313217 in words is "two hundred fifteen trillion, one hundred thirty-four billion, five hundred forty-one million, three hundred thirteen thousand, two hundred seventeen".