2217779 has 2 divisors, whose sum is σ = 2217780. Its totient is φ = 2217778.

The previous prime is 2217773. The next prime is 2217799. The reversal of 2217779 is 9777122.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2217779 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2217773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1108889 + 1108890.

It is an arithmetic number, because the mean of its divisors is an integer number (1108890).

2^2217779 is an apocalyptic number.

2217779 is a deficient number, since it is larger than the sum of its proper divisors (1).

2217779 is an equidigital number, since it uses as much as digits as its factorization.

2217779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12348, while the sum is 35.

The square root of 2217779 is about 1489.2209372689. The cubic root of 2217779 is about 130.4085568738.

It can be divided in two parts, 221 and 7779, that added together give a cube (8000 = 20³).

The spelling of 2217779 in words is "two million, two hundred seventeen thousand, seven hundred seventy-nine".