2117147779 has 2 divisors, whose sum is σ = 2117147780. Its totient is φ = 2117147778.

The previous prime is 2117147741. The next prime is 2117147833. The reversal of 2117147779 is 9777417112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2117147779 - 2⁹ = 2117147267 is a prime.

It is not a weakly prime, because it can be changed into another prime (2117147729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1058573889 + 1058573890.

It is an arithmetic number, because the mean of its divisors is an integer number (1058573890).

Almost surely, 2^2117147779 is an apocalyptic number.

2117147779 is a deficient number, since it is larger than the sum of its proper divisors (1).

2117147779 is an equidigital number, since it uses as much as digits as its factorization.

2117147779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172872, while the sum is 46.

The square root of 2117147779 is about 46012.4741673386. The cubic root of 2117147779 is about 1284.0552901321.

The spelling of 2117147779 in words is "two billion, one hundred seventeen million, one hundred forty-seven thousand, seven hundred seventy-nine".