217587241 has 2 divisors, whose sum is σ = 217587242. Its totient is φ = 217587240.

The previous prime is 217587193. The next prime is 217587247. The reversal of 217587241 is 142785712.

217587241 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., 147379600 + 70207641 = 12140^2 + 8379^2 .

It is a cyclic number.

It is not a de Polignac number, because 217587241 - 2⁷ = 217587113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 217587241.

It is not a weakly prime, because it can be changed into another prime (217587247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108793620 + 108793621.

It is an arithmetic number, because the mean of its divisors is an integer number (108793621).

Almost surely, 2^217587241 is an apocalyptic number.

It is an amenable number.

217587241 is a deficient number, since it is larger than the sum of its proper divisors (1).

217587241 is an equidigital number, since it uses as much as digits as its factorization.

217587241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31360, while the sum is 37.

The square root of 217587241 is about 14750.8386541240. The cubic root of 217587241 is about 601.4660823457.

The spelling of 217587241 in words is "two hundred seventeen million, five hundred eighty-seven thousand, two hundred forty-one".