2217491 has 2 divisors, whose sum is σ = 2217492. Its totient is φ = 2217490.

The previous prime is 2217473. The next prime is 2217493. The reversal of 2217491 is 1947122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2217491 - 2¹⁴ = 2201107 is a prime.

Together with 2217493, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2217491.

It is not a weakly prime, because it can be changed into another prime (2217493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1108745 + 1108746.

It is an arithmetic number, because the mean of its divisors is an integer number (1108746).

2^2217491 is an apocalyptic number.

2217491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2217491 is an equidigital number, since it uses as much as digits as its factorization.

2217491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 26.

The square root of 2217491 is about 1489.1242392762. The cubic root of 2217491 is about 130.4029116930.

The spelling of 2217491 in words is "two million, two hundred seventeen thousand, four hundred ninety-one".