2221789 has 2 divisors, whose sum is σ = 2221790. Its totient is φ = 2221788.

The previous prime is 2221771. The next prime is 2221829. The reversal of 2221789 is 9871222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2199289 + 22500 = 1483^2 + 150^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221789 - 2⁵ = 2221757 is a prime.

It is a d-powerful number, because it can be written as 2 + 2¹⁵ + 2²¹ + 1 + 7² + 8⁵ + 9⁵ .

It is a self number, because there is not a number n which added to its sum of digits gives 2221789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2221589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110894 + 1110895.

It is an arithmetic number, because the mean of its divisors is an integer number (1110895).

2^2221789 is an apocalyptic number.

It is an amenable number.

2221789 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221789 is an equidigital number, since it uses as much as digits as its factorization.

2221789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 31.

The square root of 2221789 is about 1490.5666707665. The cubic root of 2221789 is about 130.4871074495.

The spelling of 2221789 in words is "two million, two hundred twenty-one thousand, seven hundred eighty-nine".