111642617 has 2 divisors, whose sum is σ = 111642618. Its totient is φ = 111642616.

The previous prime is 111642607. The next prime is 111642637. The reversal of 111642617 is 716246111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111598096 + 44521 = 10564^2 + 211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111642617 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111642617.

It is not a weakly prime, because it can be changed into another prime (111642607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55821308 + 55821309.

It is an arithmetic number, because the mean of its divisors is an integer number (55821309).

Almost surely, 2^111642617 is an apocalyptic number.

It is an amenable number.

111642617 is a deficient number, since it is larger than the sum of its proper divisors (1).

111642617 is an equidigital number, since it uses as much as digits as its factorization.

111642617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 29.

The square root of 111642617 is about 10566.1069935904. The cubic root of 111642617 is about 481.5152018469.

Adding to 111642617 its reverse (716246111), we get a palindrome (827888728).

The spelling of 111642617 in words is "one hundred eleven million, six hundred forty-two thousand, six hundred seventeen".