111146561 has 16 divisors (see below), whose sum is σ = 125141760. Its totient is φ = 98092800.

The previous prime is 111146551. The next prime is 111146569. The reversal of 111146561 is 165641111.

It is a cyclic number.

It is not a de Polignac number, because 111146561 - 2¹⁴ = 111130177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111146561.

It is not an unprimeable number, because it can be changed into a prime (111146569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30920 + ... + 34326.

It is an arithmetic number, because the mean of its divisors is an integer number (7821360).

Almost surely, 2^111146561 is an apocalyptic number.

It is an amenable number.

111146561 is a deficient number, since it is larger than the sum of its proper divisors (13995199).

111146561 is a wasteful number, since it uses less digits than its factorization.

111146561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3544.

The product of its digits is 720, while the sum is 26.

The square root of 111146561 is about 10542.6069356682. The cubic root of 111146561 is about 480.8009789197.

Adding to 111146561 its reverse (165641111), we get a palindrome (276787672).

The spelling of 111146561 in words is "one hundred eleven million, one hundred forty-six thousand, five hundred sixty-one".