215707117 has 2 divisors, whose sum is σ = 215707118. Its totient is φ = 215707116.

The previous prime is 215707099. The next prime is 215707139. The reversal of 215707117 is 711707512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214886281 + 820836 = 14659^2 + 906^2 .

It is a cyclic number.

It is not a de Polignac number, because 215707117 - 2⁷ = 215706989 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 (215707157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107853558 + 107853559.

It is an arithmetic number, because the mean of its divisors is an integer number (107853559).

Almost surely, 2^215707117 is an apocalyptic number.

It is an amenable number.

215707117 is a deficient number, since it is larger than the sum of its proper divisors (1).

215707117 is an equidigital number, since it uses as much as digits as its factorization.

215707117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3430, while the sum is 31.

The square root of 215707117 is about 14686.9709947286. The cubic root of 215707117 is about 599.7286893731.

The spelling of 215707117 in words is "two hundred fifteen million, seven hundred seven thousand, one hundred seventeen".