215797 has 2 divisors, whose sum is σ = 215798. Its totient is φ = 215796.

The previous prime is 215771. The next prime is 215801. The reversal of 215797 is 797512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194481 + 21316 = 441^2 + 146^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215797 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 (215737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107898 + 107899.

It is an arithmetic number, because the mean of its divisors is an integer number (107899).

2²¹⁵⁷⁹⁷ is an apocalyptic number.

It is an amenable number.

215797 is a deficient number, since it is larger than the sum of its proper divisors (1).

215797 is an equidigital number, since it uses as much as digits as its factorization.

215797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4410, while the sum is 31.

The square root of 215797 is about 464.5395569809. The cubic root of 215797 is about 59.9811978123.

The spelling of 215797 in words is "two hundred fifteen thousand, seven hundred ninety-seven".