2117178979 has 2 divisors, whose sum is σ = 2117178980. Its totient is φ = 2117178978.

The previous prime is 2117178937. The next prime is 2117178991. The reversal of 2117178979 is 9798717112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2117178979 - 2⁹ = 2117178467 is a prime.

It is not a weakly prime, because it can be changed into another prime (2117179979) 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, 1058589489 + 1058589490.

It is an arithmetic number, because the mean of its divisors is an integer number (1058589490).

Almost surely, 2^2117178979 is an apocalyptic number.

2117178979 is a deficient number, since it is larger than the sum of its proper divisors (1).

2117178979 is an equidigital number, since it uses as much as digits as its factorization.

2117178979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 444528, while the sum is 52.

The square root of 2117178979 is about 46012.8132045847. The cubic root of 2117178979 is about 1284.0615977265.

The spelling of 2117178979 in words is "two billion, one hundred seventeen million, one hundred seventy-eight thousand, nine hundred seventy-nine".