111345581 has 2 divisors, whose sum is σ = 111345582. Its totient is φ = 111345580.

The previous prime is 111345569. The next prime is 111345613. The reversal of 111345581 is 185543111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110460100 + 885481 = 10510^2 + 941^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111345581 is a prime.

It is a super-3 number, since 3×111345581³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111345281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55672790 + 55672791.

It is an arithmetic number, because the mean of its divisors is an integer number (55672791).

Almost surely, 2^111345581 is an apocalyptic number.

It is an amenable number.

111345581 is a deficient number, since it is larger than the sum of its proper divisors (1).

111345581 is an equidigital number, since it uses as much as digits as its factorization.

111345581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2400, while the sum is 29.

The square root of 111345581 is about 10552.0415560213. The cubic root of 111345581 is about 481.0877832762.

Adding to 111345581 its reverse (185543111), we get a palindrome (296888692).

The spelling of 111345581 in words is "one hundred eleven million, three hundred forty-five thousand, five hundred eighty-one".