195811943 has 2 divisors, whose sum is σ = 195811944. Its totient is φ = 195811942.

The previous prime is 195811939. The next prime is 195811969. The reversal of 195811943 is 349118591.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 195811943 - 2² = 195811939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 195811943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195811243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97905971 + 97905972.

It is an arithmetic number, because the mean of its divisors is an integer number (97905972).

Almost surely, 2^195811943 is an apocalyptic number.

195811943 is a deficient number, since it is larger than the sum of its proper divisors (1).

195811943 is an equidigital number, since it uses as much as digits as its factorization.

195811943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 41.

The square root of 195811943 is about 13993.2820667633. The cubic root of 195811943 is about 580.6927345169.

The spelling of 195811943 in words is "one hundred ninety-five million, eight hundred eleven thousand, nine hundred forty-three".