2217749 has 2 divisors, whose sum is σ = 2217750. Its totient is φ = 2217748.

The previous prime is 2217673. The next prime is 2217757. The reversal of 2217749 is 9477122.

2217749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2010724 + 207025 = 1418^2 + 455^2 .

It is a cyclic number.

It is not a de Polignac number, because 2217749 - 2⁸ = 2217493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2217779) 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, 1108874 + 1108875.

It is an arithmetic number, because the mean of its divisors is an integer number (1108875).

2^2217749 is an apocalyptic number.

It is an amenable number.

2217749 is a deficient number, since it is larger than the sum of its proper divisors (1).

2217749 is an equidigital number, since it uses as much as digits as its factorization.

2217749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 32.

The square root of 2217749 is about 1489.2108648543. The cubic root of 2217749 is about 130.4079688570.

It can be divided in two parts, 22 and 17749, that added together give a palindrome (17771).

The spelling of 2217749 in words is "two million, two hundred seventeen thousand, seven hundred forty-nine".