215124317 has 2 divisors, whose sum is σ = 215124318. Its totient is φ = 215124316.

The previous prime is 215124293. The next prime is 215124331. The reversal of 215124317 is 713421512.

215124317 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215091556 + 32761 = 14666^2 + 181^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215124317 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215124397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107562158 + 107562159.

It is an arithmetic number, because the mean of its divisors is an integer number (107562159).

Almost surely, 2^215124317 is an apocalyptic number.

It is an amenable number.

215124317 is a deficient number, since it is larger than the sum of its proper divisors (1).

215124317 is an equidigital number, since it uses as much as digits as its factorization.

215124317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 26.

The square root of 215124317 is about 14667.1168605149. The cubic root of 215124317 is about 599.1880842243.

Adding to 215124317 its reverse (713421512), we get a palindrome (928545829).

The spelling of 215124317 in words is "two hundred fifteen million, one hundred twenty-four thousand, three hundred seventeen".