2217643 has 2 divisors, whose sum is σ = 2217644. Its totient is φ = 2217642.

The previous prime is 2217641. The next prime is 2217671. The reversal of 2217643 is 3467122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2217643 - 2¹ = 2217641 is a prime.

Together with 2217641, it forms a pair of twin primes.

It is a d-powerful number, because it can be written as 2⁹ + 2²¹ + 1 + 7⁶ + 6⁴ + 4⁵ + 3² .

It is not a weakly prime, because it can be changed into another prime (2217641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1108821 + 1108822.

It is an arithmetic number, because the mean of its divisors is an integer number (1108822).

2^2217643 is an apocalyptic number.

2217643 is a deficient number, since it is larger than the sum of its proper divisors (1).

2217643 is an equidigital number, since it uses as much as digits as its factorization.

2217643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 25.

The square root of 2217643 is about 1489.1752751104. The cubic root of 2217643 is about 130.4058911549.

The spelling of 2217643 in words is "two million, two hundred seventeen thousand, six hundred forty-three".