215985713 has 2 divisors, whose sum is σ = 215985714. Its totient is φ = 215985712.

The previous prime is 215985691. The next prime is 215985769. The reversal of 215985713 is 317589512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164044864 + 51940849 = 12808^2 + 7207^2 .

It is a cyclic number.

It is not a de Polignac number, because 215985713 - 2¹⁰ = 215984689 is a prime.

It is not a weakly prime, because it can be changed into another prime (215985013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107992856 + 107992857.

It is an arithmetic number, because the mean of its divisors is an integer number (107992857).

Almost surely, 2^215985713 is an apocalyptic number.

It is an amenable number.

215985713 is a deficient number, since it is larger than the sum of its proper divisors (1).

215985713 is an equidigital number, since it uses as much as digits as its factorization.

215985713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 41.

The square root of 215985713 is about 14696.4523950510. The cubic root of 215985713 is about 599.9867710046.

The spelling of 215985713 in words is "two hundred fifteen million, nine hundred eighty-five thousand, seven hundred thirteen".