111144331431 has 24 divisors (see below), whose sum is σ = 183609357984. Its totient is φ = 63465007680.

The previous prime is 111144331427. The next prime is 111144331453. The reversal of 111144331431 is 134133441111.

It is not a de Polignac number, because 111144331431 - 2² = 111144331427 is a prime.

It is a super-2 number, since 2×111144331431² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 111144331395 and 111144331404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111144331531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 551736 + ... + 725741.

It is an arithmetic number, because the mean of its divisors is an integer number (7650389916).

Almost surely, 2^111144331431 is an apocalyptic number.

111144331431 is a deficient number, since it is larger than the sum of its proper divisors (72465026553).

111144331431 is a wasteful number, since it uses less digits than its factorization.

111144331431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278871 (or 1278868 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

Adding to 111144331431 its reverse (134133441111), we get a palindrome (245277772542).

The spelling of 111144331431 in words is "one hundred eleven billion, one hundred forty-four million, three hundred thirty-one thousand, four hundred thirty-one".