111111420431 has 16 divisors (see below), whose sum is σ = 125176335648. Its totient is φ = 97737321600.

The previous prime is 111111420397. The next prime is 111111420451. The reversal of 111111420431 is 134024111111.

It is a cyclic number.

It is not a de Polignac number, because 111111420431 - 2¹⁸ = 111111158287 is a prime.

It is a super-2 number, since 2×111111420431² (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 (111111420451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 680480 + ... + 827813.

It is an arithmetic number, because the mean of its divisors is an integer number (7823520978).

Almost surely, 2^111111420431 is an apocalyptic number.

111111420431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111111420431 is a deficient number, since it is larger than the sum of its proper divisors (14064915217).

111111420431 is a wasteful number, since it uses less digits than its factorization.

111111420431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1508522.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 111111420431 its reverse (134024111111), we get a palindrome (245135531542).

The spelling of 111111420431 in words is "one hundred eleven billion, one hundred eleven million, four hundred twenty thousand, four hundred thirty-one".