111335561 has 2 divisors, whose sum is σ = 111335562. Its totient is φ = 111335560.

The previous prime is 111335551. The next prime is 111335579. The reversal of 111335561 is 165533111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85008400 + 26327161 = 9220^2 + 5131^2 .

It is a cyclic number.

It is not a de Polignac number, because 111335561 - 2¹⁰ = 111334537 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111335561.

It is not a weakly prime, because it can be changed into another prime (111335501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55667780 + 55667781.

It is an arithmetic number, because the mean of its divisors is an integer number (55667781).

Almost surely, 2^111335561 is an apocalyptic number.

It is an amenable number.

111335561 is a deficient number, since it is larger than the sum of its proper divisors (1).

111335561 is an equidigital number, since it uses as much as digits as its factorization.

111335561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1350, while the sum is 26.

The square root of 111335561 is about 10551.5667557003. The cubic root of 111335561 is about 481.0733517974.

Adding to 111335561 its reverse (165533111), we get a palindrome (276868672).

The spelling of 111335561 in words is "one hundred eleven million, three hundred thirty-five thousand, five hundred sixty-one".