201181316617 has 2 divisors, whose sum is σ = 201181316618. Its totient is φ = 201181316616.

The previous prime is 201181316603. The next prime is 201181316627. The reversal of 201181316617 is 716613181102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147105999936 + 54075316681 = 383544^2 + 232541^2 .

It is a cyclic number.

It is not a de Polignac number, because 201181316617 - 2³⁵ = 166821578249 is a prime.

It is not a weakly prime, because it can be changed into another prime (201181316627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100590658308 + 100590658309.

It is an arithmetic number, because the mean of its divisors is an integer number (100590658309).

Almost surely, 2^201181316617 is an apocalyptic number.

It is an amenable number.

201181316617 is a deficient number, since it is larger than the sum of its proper divisors (1).

201181316617 is an equidigital number, since it uses as much as digits as its factorization.

201181316617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 37.

Adding to 201181316617 its reverse (716613181102), we get a palindrome (917794497719).

The spelling of 201181316617 in words is "two hundred one billion, one hundred eighty-one million, three hundred sixteen thousand, six hundred seventeen".