3197991943 has 2 divisors, whose sum is σ = 3197991944. Its totient is φ = 3197991942.

The previous prime is 3197991887. The next prime is 3197991971. The reversal of 3197991943 is 3491997913.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (3491997913) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3197991943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3197991143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1598995971 + 1598995972.

It is an arithmetic number, because the mean of its divisors is an integer number (1598995972).

Almost surely, 2^3197991943 is an apocalyptic number.

3197991943 is a deficient number, since it is larger than the sum of its proper divisors (1).

3197991943 is an equidigital number, since it uses as much as digits as its factorization.

3197991943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1653372, while the sum is 55.

The square root of 3197991943 is about 56550.7908255932. The cubic root of 3197991943 is about 1473.3042955735.

The spelling of 3197991943 in words is "three billion, one hundred ninety-seven million, nine hundred ninety-one thousand, nine hundred forty-three".