203111123311 has 4 divisors (see below), whose sum is σ = 203236424824. Its totient is φ = 202985821800.

The previous prime is 203111123291. The next prime is 203111123333. The reversal of 203111123311 is 113321111302.

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

It is a cyclic number.

It is not a de Polignac number, because 203111123311 - 2⁷ = 203111123183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203111126311) 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 in 3 ways as a sum of consecutive naturals, for example, 62648325 + ... + 62651566.

It is an arithmetic number, because the mean of its divisors is an integer number (50809106206).

Almost surely, 2^203111123311 is an apocalyptic number.

203111123311 is a deficient number, since it is larger than the sum of its proper divisors (125301513).

203111123311 is a wasteful number, since it uses less digits than its factorization.

203111123311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125301512.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 203111123311 its reverse (113321111302), we get a palindrome (316432234613).

The spelling of 203111123311 in words is "two hundred three billion, one hundred eleven million, one hundred twenty-three thousand, three hundred eleven".