215643113 has 24 divisors (see below), whose sum is σ = 265838976. Its totient is φ = 170760960.

The previous prime is 215643089. The next prime is 215643121. The reversal of 215643113 is 311346512.

It is not a de Polignac number, because 215643113 - 2⁶ = 215643049 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (215643133) 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 in 23 ways as a sum of consecutive naturals, for example, 442556 + ... + 443042.

It is an arithmetic number, because the mean of its divisors is an integer number (11076624).

Almost surely, 2^215643113 is an apocalyptic number.

It is an amenable number.

215643113 is a deficient number, since it is larger than the sum of its proper divisors (50195863).

215643113 is an equidigital number, since it uses as much as digits as its factorization.

215643113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633 (or 572 counting only the distinct ones).

The product of its digits is 2160, while the sum is 26.

The square root of 215643113 is about 14684.7918950185. The cubic root of 215643113 is about 599.6693669105.

Adding to 215643113 its reverse (311346512), we get a palindrome (526989625).

The spelling of 215643113 in words is "two hundred fifteen million, six hundred forty-three thousand, one hundred thirteen".