203431031011 has 16 divisors (see below), whose sum is σ = 231212298240. Its totient is φ = 177434629920.

The previous prime is 203431031003. The next prime is 203431031033. The reversal of 203431031011 is 110130134302.

It is a cyclic number.

It is not a de Polignac number, because 203431031011 - 2³ = 203431031003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 203431031011.

It is not an unprimeable number, because it can be changed into a prime (203431037011) 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 15 ways as a sum of consecutive naturals, for example, 980605 + ... + 1169806.

It is an arithmetic number, because the mean of its divisors is an integer number (14450768640).

Almost surely, 2^203431031011 is an apocalyptic number.

203431031011 is a deficient number, since it is larger than the sum of its proper divisors (27781267229).

203431031011 is a wasteful number, since it uses less digits than its factorization.

203431031011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2150826.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 203431031011 its reverse (110130134302), we get a palindrome (313561165313).

The spelling of 203431031011 in words is "two hundred three billion, four hundred thirty-one million, thirty-one thousand, eleven".