2217947 has 2 divisors, whose sum is σ = 2217948. Its totient is φ = 2217946.

The previous prime is 2217911. The next prime is 2217967. The reversal of 2217947 is 7497122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2217947 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2217907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1108973 + 1108974.

It is an arithmetic number, because the mean of its divisors is an integer number (1108974).

2^2217947 is an apocalyptic number.

2217947 is a deficient number, since it is larger than the sum of its proper divisors (1).

2217947 is an equidigital number, since it uses as much as digits as its factorization.

2217947 is an evil number, because the sum of its binary digits is even.

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

The square root of 2217947 is about 1489.2773415318. The cubic root of 2217947 is about 130.4118496703.

The spelling of 2217947 in words is "two million, two hundred seventeen thousand, nine hundred forty-seven".