111136661 has 2 divisors, whose sum is σ = 111136662. Its totient is φ = 111136660.

The previous prime is 111136657. The next prime is 111136679. The reversal of 111136661 is 166631111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60996100 + 50140561 = 7810^2 + 7081^2 .

It is a cyclic number.

It is not a de Polignac number, because 111136661 - 2² = 111136657 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 111136661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111136631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55568330 + 55568331.

It is an arithmetic number, because the mean of its divisors is an integer number (55568331).

Almost surely, 2^111136661 is an apocalyptic number.

It is an amenable number.

111136661 is a deficient number, since it is larger than the sum of its proper divisors (1).

111136661 is an equidigital number, since it uses as much as digits as its factorization.

111136661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 26.

The square root of 111136661 is about 10542.1374018744. The cubic root of 111136661 is about 480.7867032613.

Adding to 111136661 its reverse (166631111), we get a palindrome (277767772).

The spelling of 111136661 in words is "one hundred eleven million, one hundred thirty-six thousand, six hundred sixty-one".