111144440431 has 2 divisors, whose sum is σ = 111144440432. Its totient is φ = 111144440430.

The previous prime is 111144440387. The next prime is 111144440443. The reversal of 111144440431 is 134044441111.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111144440431 - 2¹⁷ = 111144309359 is a prime.

It is a super-2 number, since 2×111144440431² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 111144440431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111144440731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55572220215 + 55572220216.

It is an arithmetic number, because the mean of its divisors is an integer number (55572220216).

Almost surely, 2^111144440431 is an apocalyptic number.

111144440431 is a deficient number, since it is larger than the sum of its proper divisors (1).

111144440431 is an equidigital number, since it uses as much as digits as its factorization.

111144440431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 28.

Adding to 111144440431 its reverse (134044441111), we get a palindrome (245188881542).

The spelling of 111144440431 in words is "one hundred eleven billion, one hundred forty-four million, four hundred forty thousand, four hundred thirty-one".