201115217 has 2 divisors, whose sum is σ = 201115218. Its totient is φ = 201115216.

The previous prime is 201115177. The next prime is 201115237. The reversal of 201115217 is 712511102.

It is a happy number.

It is an a-pointer prime, because the next prime (201115237) can be obtained adding 201115217 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193738561 + 7376656 = 13919^2 + 2716^2 .

It is a cyclic number.

It is not a de Polignac number, because 201115217 - 2⁶ = 201115153 is a prime.

It is not a weakly prime, because it can be changed into another prime (201115237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100557608 + 100557609.

It is an arithmetic number, because the mean of its divisors is an integer number (100557609).

Almost surely, 2^201115217 is an apocalyptic number.

It is an amenable number.

201115217 is a deficient number, since it is larger than the sum of its proper divisors (1).

201115217 is an equidigital number, since it uses as much as digits as its factorization.

201115217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 140, while the sum is 20.

The square root of 201115217 is about 14181.5096869127. The cubic root of 201115217 is about 585.8885049597. Note that the first 3 decimals are identical.

Adding to 201115217 its reverse (712511102), we get a palindrome (913626319).

The spelling of 201115217 in words is "two hundred one million, one hundred fifteen thousand, two hundred seventeen".