201023113209 has 4 divisors (see below), whose sum is σ = 268030817616. Its totient is φ = 134015408804.

The previous prime is 201023113199. The next prime is 201023113217. The reversal of 201023113209 is 902311320102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201023113209 - 2¹⁵ = 201023080441 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (201023113229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33503852199 + ... + 33503852204.

It is an arithmetic number, because the mean of its divisors is an integer number (67007704404).

Almost surely, 2^201023113209 is an apocalyptic number.

It is an amenable number.

201023113209 is a deficient number, since it is larger than the sum of its proper divisors (67007704407).

201023113209 is an equidigital number, since it uses as much as digits as its factorization.

201023113209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67007704406.

The product of its (nonzero) digits is 648, while the sum is 24.

The spelling of 201023113209 in words is "two hundred one billion, twenty-three million, one hundred thirteen thousand, two hundred nine".