203131103311 has 4 divisors (see below), whose sum is σ = 203279051592. Its totient is φ = 202983155032.

The previous prime is 203131103261. The next prime is 203131103317. The reversal of 203131103311 is 113301131302.

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 203131103311 - 2⁷ = 203131103183 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 (203131103317) 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, 73972081 + ... + 73974826.

It is an arithmetic number, because the mean of its divisors is an integer number (50819762898).

Almost surely, 2^203131103311 is an apocalyptic number.

203131103311 is a deficient number, since it is larger than the sum of its proper divisors (147948281).

203131103311 is a wasteful number, since it uses less digits than its factorization.

203131103311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147948280.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 203131103311 its reverse (113301131302), we get a palindrome (316432234613).

The spelling of 203131103311 in words is "two hundred three billion, one hundred thirty-one million, one hundred three thousand, three hundred eleven".