215983 has 2 divisors, whose sum is σ = 215984. Its totient is φ = 215982.

The previous prime is 215981. The next prime is 216023. The reversal of 215983 is 389512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215983 - 2¹ = 215981 is a prime.

Together with 215981, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107991 + 107992.

It is an arithmetic number, because the mean of its divisors is an integer number (107992).

215983 is a Friedman number, since it can be written as (12*5)^3-9-8, using all its digits and the basic arithmetic operations.

2²¹⁵⁹⁸³ is an apocalyptic number.

215983 is a deficient number, since it is larger than the sum of its proper divisors (1).

215983 is an equidigital number, since it uses as much as digits as its factorization.

215983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 28.

The square root of 215983 is about 464.7397120970. The cubic root of 215983 is about 59.9984258846.

The spelling of 215983 in words is "two hundred fifteen thousand, nine hundred eighty-three".