111561745 has 4 divisors (see below), whose sum is σ = 133874100. Its totient is φ = 89249392.

The previous prime is 111561733. The next prime is 111561773. The reversal of 111561745 is 547165111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 547165111 = 17 ⋅32186183.

It can be written as a sum of positive squares in 2 ways, for example, as 45171841 + 66389904 = 6721^2 + 8148^2 .

It is a cyclic number.

It is not a de Polignac number, because 111561745 - 2¹³ = 111553553 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11156170 + ... + 11156179.

It is an arithmetic number, because the mean of its divisors is an integer number (33468525).

Almost surely, 2^111561745 is an apocalyptic number.

It is an amenable number.

111561745 is a deficient number, since it is larger than the sum of its proper divisors (22312355).

111561745 is an equidigital number, since it uses as much as digits as its factorization.

111561745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22312354.

The product of its digits is 4200, while the sum is 31.

The square root of 111561745 is about 10562.2793468077. The cubic root of 111561745 is about 481.3989066394.

The spelling of 111561745 in words is "one hundred eleven million, five hundred sixty-one thousand, seven hundred forty-five".