111595661 has 2 divisors, whose sum is σ = 111595662. Its totient is φ = 111595660.

The previous prime is 111595643. The next prime is 111595699. The reversal of 111595661 is 166595111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70392100 + 41203561 = 8390^2 + 6419^2 .

It is a cyclic number.

It is not a de Polignac number, because 111595661 - 2⁶ = 111595597 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111595261) 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, 55797830 + 55797831.

It is an arithmetic number, because the mean of its divisors is an integer number (55797831).

Almost surely, 2^111595661 is an apocalyptic number.

It is an amenable number.

111595661 is a deficient number, since it is larger than the sum of its proper divisors (1).

111595661 is an equidigital number, since it uses as much as digits as its factorization.

111595661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8100, while the sum is 35.

The square root of 111595661 is about 10563.8847494660. The cubic root of 111595661 is about 481.4476852210.

The spelling of 111595661 in words is "one hundred eleven million, five hundred ninety-five thousand, six hundred sixty-one".