11111113431 has 48 divisors (see below), whose sum is σ = 18036983328. Its totient is φ = 6531840000.

The previous prime is 11111113421. The next prime is 11111113451. The reversal of 11111113431 is 13431111111.

11111113431 is a `hidden beast` number, since 11 + 111 + 113 + 431 = 666.

It is not a de Polignac number, because 11111113431 - 2¹⁰ = 11111112407 is a prime.

It is a super-2 number, since 2×11111113431² (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 (11111113421) 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, 1229931 + ... + 1238931.

It is an arithmetic number, because the mean of its divisors is an integer number (375770486).

Almost surely, 2^11111113431 is an apocalyptic number.

11111113431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11111113431 is a deficient number, since it is larger than the sum of its proper divisors (6925869897).

11111113431 is a wasteful number, since it uses less digits than its factorization.

11111113431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9392 (or 9389 counting only the distinct ones).

The product of its digits is 36, while the sum is 18.

Adding to 11111113431 its reverse (13431111111), we get a palindrome (24542224542).

The spelling of 11111113431 in words is "eleven billion, one hundred eleven million, one hundred thirteen thousand, four hundred thirty-one".