201110121101609 has 2 divisors, whose sum is σ = 201110121101610. Its totient is φ = 201110121101608.

The previous prime is 201110121101599. The next prime is 201110121101611. The reversal of 201110121101609 is 906101121011102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196805545987600 + 4304575114009 = 14028740^2 + 2074747^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201110121101609 is a prime.

Together with 201110121101611, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (201110121101689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100555060550804 + 100555060550805.

It is an arithmetic number, because the mean of its divisors is an integer number (100555060550805).

Almost surely, 2^{201110121101609} is an apocalyptic number.

It is an amenable number.

201110121101609 is a deficient number, since it is larger than the sum of its proper divisors (1).

201110121101609 is an equidigital number, since it uses as much as digits as its factorization.

201110121101609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 26.

The spelling of 201110121101609 in words is "two hundred one trillion, one hundred ten billion, one hundred twenty-one million, one hundred one thousand, six hundred nine".