111408091831 has 4 divisors (see below), whose sum is σ = 115249750200. Its totient is φ = 107566433464.

The previous prime is 111408091811. The next prime is 111408091901. The reversal of 111408091831 is 138190804111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 138190804111 = 197 ⋅701476163.

It is a cyclic number.

It is not a de Polignac number, because 111408091831 - 2¹³ = 111408083639 is a prime.

It is a super-2 number, since 2×111408091831² (a number of 23 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 (111408091811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1920829141 + ... + 1920829198.

It is an arithmetic number, because the mean of its divisors is an integer number (28812437550).

Almost surely, 2^111408091831 is an apocalyptic number.

111408091831 is a deficient number, since it is larger than the sum of its proper divisors (3841658369).

111408091831 is an equidigital number, since it uses as much as digits as its factorization.

111408091831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3841658368.

The product of its (nonzero) digits is 6912, while the sum is 37.

Adding to 111408091831 its reverse (138190804111), we get a palindrome (249598895942).

The spelling of 111408091831 in words is "one hundred eleven billion, four hundred eight million, ninety-one thousand, eight hundred thirty-one".