203131323011 has 4 divisors (see below), whose sum is σ = 203173638024. Its totient is φ = 203089008000.

The previous prime is 203131322993. The next prime is 203131323023. The reversal of 203131323011 is 110323131302.

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 203131323011 - 2²⁶ = 203064214147 is a prime.

It is a super-2 number, since 2×203131323011² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203131323071) 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, 21150305 + ... + 21159906.

It is an arithmetic number, because the mean of its divisors is an integer number (50793409506).

Almost surely, 2^203131323011 is an apocalyptic number.

203131323011 is a deficient number, since it is larger than the sum of its proper divisors (42315013).

203131323011 is an equidigital number, since it uses as much as digits as its factorization.

203131323011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42315012.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 203131323011 its reverse (110323131302), we get a palindrome (313454454313).

The spelling of 203131323011 in words is "two hundred three billion, one hundred thirty-one million, three hundred twenty-three thousand, eleven".