111416431681 has 3 divisors (see below), whose sum is σ = 111416765473. Its totient is φ = 111416097890.

The previous prime is 111416431657. The next prime is 111416431727. The reversal of 111416431681 is 186134614111.

The square root of 111416431681 is 333791.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 186134614111 = 22391 ⋅8312921.

It is not a de Polignac number, because 111416431681 - 2²¹ = 111414334529 is a prime.

It is a super-2 number, since 2×111416431681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111416431681.

It is not an unprimeable number, because it can be changed into a prime (111416431381) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 166896 + ... + 500686.

Almost surely, 2^111416431681 is an apocalyptic number.

111416431681 is the 333791-st square number.

111416431681 is the 166896-th centered octagonal number.

It is an amenable number.

111416431681 is a deficient number, since it is larger than the sum of its proper divisors (333792).

111416431681 is an frugal number, since it uses more digits than its factorization.

111416431681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667582 (or 333791 counting only the distinct ones).

The product of its digits is 13824, while the sum is 37.

The spelling of 111416431681 in words is "one hundred eleven billion, four hundred sixteen million, four hundred thirty-one thousand, six hundred eighty-one".