213685943 has 2 divisors, whose sum is σ = 213685944. Its totient is φ = 213685942.

The previous prime is 213685909. The next prime is 213685957. The reversal of 213685943 is 349586312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213685943 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213685943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213682943) 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, 106842971 + 106842972.

It is an arithmetic number, because the mean of its divisors is an integer number (106842972).

Almost surely, 2^213685943 is an apocalyptic number.

213685943 is a deficient number, since it is larger than the sum of its proper divisors (1).

213685943 is an equidigital number, since it uses as much as digits as its factorization.

213685943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 41.

The square root of 213685943 is about 14618.0006498837. Note that the first 3 decimals coincide. The cubic root of 213685943 is about 597.8496572127.

The spelling of 213685943 in words is "two hundred thirteen million, six hundred eighty-five thousand, nine hundred forty-three".