111741781 has 2 divisors, whose sum is σ = 111741782. Its totient is φ = 111741780.

The previous prime is 111741689. The next prime is 111741803. The reversal of 111741781 is 187147111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84805681 + 26936100 = 9209^2 + 5190^2 .

It is an emirp because it is prime and its reverse (187147111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111741781 - 2¹⁹ = 111217493 is a prime.

It is a super-2 number, since 2×111741781² = 24972451242103922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111741281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55870890 + 55870891.

It is an arithmetic number, because the mean of its divisors is an integer number (55870891).

Almost surely, 2^111741781 is an apocalyptic number.

It is an amenable number.

111741781 is a deficient number, since it is larger than the sum of its proper divisors (1).

111741781 is an equidigital number, since it uses as much as digits as its factorization.

111741781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1568, while the sum is 31.

The square root of 111741781 is about 10570.7985034244. The cubic root of 111741781 is about 481.6577246111.

Adding to 111741781 its reverse (187147111), we get a palindrome (298888892).

The spelling of 111741781 in words is "one hundred eleven million, seven hundred forty-one thousand, seven hundred eighty-one".