111400582781 has 2 divisors, whose sum is σ = 111400582782. Its totient is φ = 111400582780.

The previous prime is 111400582747. The next prime is 111400582807. The reversal of 111400582781 is 187285004111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67738390756 + 43662192025 = 260266^2 + 208955^2 .

It is an emirp because it is prime and its reverse (187285004111) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111400582781 is a prime.

It is a super-2 number, since 2×111400582781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111400582981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55700291390 + 55700291391.

It is an arithmetic number, because the mean of its divisors is an integer number (55700291391).

Almost surely, 2^111400582781 is an apocalyptic number.

It is an amenable number.

111400582781 is a deficient number, since it is larger than the sum of its proper divisors (1).

111400582781 is an equidigital number, since it uses as much as digits as its factorization.

111400582781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17920, while the sum is 38.

Adding to 111400582781 its reverse (187285004111), we get a palindrome (298685586892).

The spelling of 111400582781 in words is "one hundred eleven billion, four hundred million, five hundred eighty-two thousand, seven hundred eighty-one".