203111312011 has 4 divisors (see below), whose sum is σ = 203287472152. Its totient is φ = 202935151872.

The previous prime is 203111311987. The next prime is 203111312023. The reversal of 203111312011 is 110213111302.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203111312011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203111312051) 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, 88078341 + ... + 88080646.

It is an arithmetic number, because the mean of its divisors is an integer number (50821868038).

Almost surely, 2^203111312011 is an apocalyptic number.

203111312011 is a deficient number, since it is larger than the sum of its proper divisors (176160141).

203111312011 is a wasteful number, since it uses less digits than its factorization.

203111312011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176160140.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 203111312011 its reverse (110213111302), we get a palindrome (313324423313).

The spelling of 203111312011 in words is "two hundred three billion, one hundred eleven million, three hundred twelve thousand, eleven".