11131333231 has 4 divisors (see below), whose sum is σ = 11132214264. Its totient is φ = 11130452200.

The previous prime is 11131333223. The next prime is 11131333259. The reversal of 11131333231 is 13233313111.

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 11131333231 - 2³ = 11131333223 is a prime.

It is a super-2 number, since 2×11131333231² (a number of 21 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 (11131333271) 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, 421285 + ... + 446926.

It is an arithmetic number, because the mean of its divisors is an integer number (2783053566).

Almost surely, 2^11131333231 is an apocalyptic number.

11131333231 is a deficient number, since it is larger than the sum of its proper divisors (881033).

11131333231 is an equidigital number, since it uses as much as digits as its factorization.

11131333231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881032.

The product of its digits is 486, while the sum is 22.

Adding to 11131333231 its reverse (13233313111), we get a palindrome (24364646342).

The spelling of 11131333231 in words is "eleven billion, one hundred thirty-one million, three hundred thirty-three thousand, two hundred thirty-one".