201111199997 has 2 divisors, whose sum is σ = 201111199998. Its totient is φ = 201111199996.

The previous prime is 201111199973. The next prime is 201111200027. The reversal of 201111199997 is 799991111102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191265400921 + 9845799076 = 437339^2 + 99226^2 .

It is a cyclic number.

It is not a de Polignac number, because 201111199997 - 2¹⁴ = 201111183613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201111199957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100555599998 + 100555599999.

It is an arithmetic number, because the mean of its divisors is an integer number (100555599999).

Almost surely, 2^201111199997 is an apocalyptic number.

It is an amenable number.

201111199997 is a deficient number, since it is larger than the sum of its proper divisors (1).

201111199997 is an equidigital number, since it uses as much as digits as its factorization.

201111199997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 91854, while the sum is 50.

The spelling of 201111199997 in words is "two hundred one billion, one hundred eleven million, one hundred ninety-nine thousand, nine hundred ninety-seven".