201003111809 has 2 divisors, whose sum is σ = 201003111810. Its totient is φ = 201003111808.

The previous prime is 201003111787. The next prime is 201003111817. The reversal of 201003111809 is 908111300102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136920720784 + 64082391025 = 370028^2 + 253145^2 .

It is a cyclic number.

It is not a de Polignac number, because 201003111809 - 2¹² = 201003107713 is a prime.

It is not a weakly prime, because it can be changed into another prime (201003111889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100501555904 + 100501555905.

It is an arithmetic number, because the mean of its divisors is an integer number (100501555905).

Almost surely, 2^201003111809 is an apocalyptic number.

It is an amenable number.

201003111809 is a deficient number, since it is larger than the sum of its proper divisors (1).

201003111809 is an equidigital number, since it uses as much as digits as its factorization.

201003111809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 26.

The spelling of 201003111809 in words is "two hundred one billion, three million, one hundred eleven thousand, eight hundred nine".