2220749 has 2 divisors, whose sum is σ = 2220750. Its totient is φ = 2220748.

The previous prime is 2220731. The next prime is 2220773. The reversal of 2220749 is 9470222.

2220749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1755625 + 465124 = 1325^2 + 682^2 .

It is a cyclic number.

It is not a de Polignac number, because 2220749 - 2¹² = 2216653 is a prime.

It is a super-2 number, since 2×2220749² = 9863452242002, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2220349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110374 + 1110375.

It is an arithmetic number, because the mean of its divisors is an integer number (1110375).

2^2220749 is an apocalyptic number.

It is an amenable number.

2220749 is a deficient number, since it is larger than the sum of its proper divisors (1).

2220749 is an equidigital number, since it uses as much as digits as its factorization.

2220749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 2220749 is about 1490.2177693210. The cubic root of 2220749 is about 130.4667443140.

The spelling of 2220749 in words is "two million, two hundred twenty thousand, seven hundred forty-nine".