1979691943 has 2 divisors, whose sum is σ = 1979691944. Its totient is φ = 1979691942.

The previous prime is 1979691937. The next prime is 1979691953. The reversal of 1979691943 is 3491969791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1979691943 - 2⁹ = 1979691431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1979691913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989845971 + 989845972.

It is an arithmetic number, because the mean of its divisors is an integer number (989845972).

Almost surely, 2^1979691943 is an apocalyptic number.

1979691943 is a deficient number, since it is larger than the sum of its proper divisors (1).

1979691943 is an equidigital number, since it uses as much as digits as its factorization.

1979691943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3306744, while the sum is 58.

The square root of 1979691943 is about 44493.7292548062. The cubic root of 1979691943 is about 1255.6421094710.

The spelling of 1979691943 in words is "one billion, nine hundred seventy-nine million, six hundred ninety-one thousand, nine hundred forty-three".