201111243309917 has 2 divisors, whose sum is σ = 201111243309918. Its totient is φ = 201111243309916.

The previous prime is 201111243309901. The next prime is 201111243310031. The reversal of 201111243309917 is 719903342111102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185726445166201 + 15384798143716 = 13628149^2 + 3922346^2 .

It is a cyclic number.

It is not a de Polignac number, because 201111243309917 - 2⁴ = 201111243309901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201111243329917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100555621654958 + 100555621654959.

It is an arithmetic number, because the mean of its divisors is an integer number (100555621654959).

Almost surely, 2^{201111243309917} is an apocalyptic number.

It is an amenable number.

201111243309917 is a deficient number, since it is larger than the sum of its proper divisors (1).

201111243309917 is an equidigital number, since it uses as much as digits as its factorization.

201111243309917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 44.

The spelling of 201111243309917 in words is "two hundred one trillion, one hundred eleven billion, two hundred forty-three million, three hundred nine thousand, nine hundred seventeen".