220843979 has 2 divisors, whose sum is σ = 220843980. Its totient is φ = 220843978.

The previous prime is 220843963. The next prime is 220844003. The reversal of 220843979 is 979348022.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 220843979 - 2⁴ = 220843963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (220843939) 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, 110421989 + 110421990.

It is an arithmetic number, because the mean of its divisors is an integer number (110421990).

Almost surely, 2^220843979 is an apocalyptic number.

220843979 is a deficient number, since it is larger than the sum of its proper divisors (1).

220843979 is an equidigital number, since it uses as much as digits as its factorization.

220843979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 220843979 is about 14860.8202667282. The cubic root of 220843979 is about 604.4520494603.

The spelling of 220843979 in words is "two hundred twenty million, eight hundred forty-three thousand, nine hundred seventy-nine".