11203131011 has 4 divisors (see below), whose sum is σ = 11203502400. Its totient is φ = 11202759624.

The previous prime is 11203131001. The next prime is 11203131031. The reversal of 11203131011 is 11013130211.

It is a happy number.

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 11203131011 - 2²⁶ = 11136022147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11203131001) 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, 136016 + ... + 202253.

It is an arithmetic number, because the mean of its divisors is an integer number (2800875600).

Almost surely, 2^11203131011 is an apocalyptic number.

11203131011 is a deficient number, since it is larger than the sum of its proper divisors (371389).

11203131011 is an equidigital number, since it uses as much as digits as its factorization.

11203131011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371388.

The product of its (nonzero) digits is 18, while the sum is 14.

Adding to 11203131011 its reverse (11013130211), we get a palindrome (22216261222).

The spelling of 11203131011 in words is "eleven billion, two hundred three million, one hundred thirty-one thousand, eleven".