203131303231 has 4 divisors (see below), whose sum is σ = 203142558312. Its totient is φ = 203120048152.

The previous prime is 203131303229. The next prime is 203131303267. The reversal of 203131303231 is 132303131302.

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 203131303231 - 2¹ = 203131303229 is a prime.

It is a super-2 number, since 2×203131303231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203131303831) 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, 5600425 + ... + 5636578.

It is an arithmetic number, because the mean of its divisors is an integer number (50785639578).

Almost surely, 2^203131303231 is an apocalyptic number.

203131303231 is a deficient number, since it is larger than the sum of its proper divisors (11255081).

203131303231 is a wasteful number, since it uses less digits than its factorization.

203131303231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11255080.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 203131303231 its reverse (132303131302), we get a palindrome (335434434533).

The spelling of 203131303231 in words is "two hundred three billion, one hundred thirty-one million, three hundred three thousand, two hundred thirty-one".