7979821973 has 2 divisors, whose sum is σ = 7979821974. Its totient is φ = 7979821972.

The previous prime is 7979821957. The next prime is 7979822023. The reversal of 7979821973 is 3791289797.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5429773969 + 2550048004 = 73687^2 + 50498^2 .

It is an emirp because it is prime and its reverse (3791289797) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7979821973 - 2⁴ = 7979821957 is a prime.

It is a super-2 number, since 2×7979821973² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7979821943) 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, 3989910986 + 3989910987.

It is an arithmetic number, because the mean of its divisors is an integer number (3989910987).

Almost surely, 2^7979821973 is an apocalyptic number.

It is an amenable number.

7979821973 is a deficient number, since it is larger than the sum of its proper divisors (1).

7979821973 is an equidigital number, since it uses as much as digits as its factorization.

7979821973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12002256, while the sum is 62.

The square root of 7979821973 is about 89329.8492834282. The cubic root of 7979821973 is about 1998.3170820408.

The spelling of 7979821973 in words is "seven billion, nine hundred seventy-nine million, eight hundred twenty-one thousand, nine hundred seventy-three".