2217861979 has 8 divisors (see below), whose sum is σ = 2262723840. Its totient is φ = 2173242600.

The previous prime is 2217861967. The next prime is 2217862019. The reversal of 2217861979 is 9791687122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2217861979 - 2⁹ = 2217861467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2217861949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42087 + ... + 78784.

It is an arithmetic number, because the mean of its divisors is an integer number (282840480).

Almost surely, 2^2217861979 is an apocalyptic number.

2217861979 is a deficient number, since it is larger than the sum of its proper divisors (44861861).

2217861979 is a wasteful number, since it uses less digits than its factorization.

2217861979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121241.

The product of its digits is 762048, while the sum is 52.

The square root of 2217861979 is about 47094.1820079721. The cubic root of 2217861979 is about 1304.1018328126.

The spelling of 2217861979 in words is "two billion, two hundred seventeen million, eight hundred sixty-one thousand, nine hundred seventy-nine".