43321989979 has 2 divisors, whose sum is σ = 43321989980. Its totient is φ = 43321989978.

The previous prime is 43321989929. The next prime is 43321990051. The reversal of 43321989979 is 97998912334.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43321989979 - 2⁹ = 43321989467 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43321989979.

It is not a weakly prime, because it can be changed into another prime (43321989929) 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, 21660994989 + 21660994990.

It is an arithmetic number, because the mean of its divisors is an integer number (21660994990).

Almost surely, 2^43321989979 is an apocalyptic number.

43321989979 is a deficient number, since it is larger than the sum of its proper divisors (1).

43321989979 is an equidigital number, since it uses as much as digits as its factorization.

43321989979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26453952, while the sum is 64.

The spelling of 43321989979 in words is "forty-three billion, three hundred twenty-one million, nine hundred eighty-nine thousand, nine hundred seventy-nine".