8193187979 has 2 divisors, whose sum is σ = 8193187980. Its totient is φ = 8193187978.

The previous prime is 8193187969. The next prime is 8193187993. The reversal of 8193187979 is 9797813918.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8193187979 is a prime.

It is not a weakly prime, because it can be changed into another prime (8193187969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4096593989 + 4096593990.

It is an arithmetic number, because the mean of its divisors is an integer number (4096593990).

Almost surely, 2^8193187979 is an apocalyptic number.

8193187979 is a deficient number, since it is larger than the sum of its proper divisors (1).

8193187979 is an equidigital number, since it uses as much as digits as its factorization.

8193187979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6858432, while the sum is 62.

The square root of 8193187979 is about 90516.2304727721. The cubic root of 8193187979 is about 2015.9711204179.

The spelling of 8193187979 in words is "eight billion, one hundred ninety-three million, one hundred eighty-seven thousand, nine hundred seventy-nine".