201009217 has 2 divisors, whose sum is σ = 201009218. Its totient is φ = 201009216.

The previous prime is 201009199. The next prime is 201009233. The reversal of 201009217 is 712900102.

201009217 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., 182682256 + 18326961 = 13516^2 + 4281^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201009217 is a prime.

It is not a weakly prime, because it can be changed into another prime (201009257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100504608 + 100504609.

It is an arithmetic number, because the mean of its divisors is an integer number (100504609).

Almost surely, 2^201009217 is an apocalyptic number.

It is an amenable number.

201009217 is a deficient number, since it is larger than the sum of its proper divisors (1).

201009217 is an equidigital number, since it uses as much as digits as its factorization.

201009217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 201009217 is about 14177.7719335585. The cubic root of 201009217 is about 585.7855538644.

Adding to 201009217 its reverse (712900102), we get a palindrome (913909319).

The spelling of 201009217 in words is "two hundred one million, nine thousand, two hundred seventeen".