217001047 has 2 divisors, whose sum is σ = 217001048. Its totient is φ = 217001046.

The previous prime is 217001011. The next prime is 217001053. The reversal of 217001047 is 740100712.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217001047 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 (217001747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108500523 + 108500524.

It is an arithmetic number, because the mean of its divisors is an integer number (108500524).

Almost surely, 2^217001047 is an apocalyptic number.

217001047 is a deficient number, since it is larger than the sum of its proper divisors (1).

217001047 is an equidigital number, since it uses as much as digits as its factorization.

217001047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 217001047 is about 14730.9554001090. The cubic root of 217001047 is about 600.9254671540.

Adding to 217001047 its reverse (740100712), we get a palindrome (957101759).

The spelling of 217001047 in words is "two hundred seventeen million, one thousand, forty-seven".