215197943 has 2 divisors, whose sum is σ = 215197944. Its totient is φ = 215197942.

The previous prime is 215197919. The next prime is 215197963. The reversal of 215197943 is 349791512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215197943 - 2⁸ = 215197687 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 215197943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215197963) 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, 107598971 + 107598972.

It is an arithmetic number, because the mean of its divisors is an integer number (107598972).

Almost surely, 2^215197943 is an apocalyptic number.

215197943 is a deficient number, since it is larger than the sum of its proper divisors (1).

215197943 is an equidigital number, since it uses as much as digits as its factorization.

215197943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 41.

The square root of 215197943 is about 14669.6265460304. The cubic root of 215197943 is about 599.2564335251.

The spelling of 215197943 in words is "two hundred fifteen million, one hundred ninety-seven thousand, nine hundred forty-three".