11311113231 has 48 divisors (see below), whose sum is σ = 19268845440. Its totient is φ = 6318855360.

The previous prime is 11311113227. The next prime is 11311113277. The reversal of 11311113231 is 13231111311.

11311113231 is a `hidden beast` number, since 11 + 311 + 113 + 231 = 666.

It is not a de Polignac number, because 11311113231 - 2² = 11311113227 is a prime.

It is a super-2 number, since 2×11311113231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11311113221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11665 + ... + 150858.

It is an arithmetic number, because the mean of its divisors is an integer number (401434280).

Almost surely, 2^11311113231 is an apocalyptic number.

11311113231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11311113231 is a deficient number, since it is larger than the sum of its proper divisors (7957732209).

11311113231 is a wasteful number, since it uses less digits than its factorization.

11311113231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162596 (or 162593 counting only the distinct ones).

The product of its digits is 54, while the sum is 18.

Adding to 11311113231 its reverse (13231111311), we get a palindrome (24542224542).

The spelling of 11311113231 in words is "eleven billion, three hundred eleven million, one hundred thirteen thousand, two hundred thirty-one".