111601601 has 2 divisors, whose sum is σ = 111601602. Its totient is φ = 111601600.

The previous prime is 111601577. The next prime is 111601603. The reversal of 111601601 is 106106111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107661376 + 3940225 = 10376^2 + 1985^2 .

It is an emirp because it is prime and its reverse (106106111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111601601 - 2²² = 107407297 is a prime.

Together with 111601603, it forms a pair of twin primes.

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 111601601.

It is not a weakly prime, because it can be changed into another prime (111601603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55800800 + 55800801.

It is an arithmetic number, because the mean of its divisors is an integer number (55800801).

Almost surely, 2^111601601 is an apocalyptic number.

It is an amenable number.

111601601 is a deficient number, since it is larger than the sum of its proper divisors (1).

111601601 is an equidigital number, since it uses as much as digits as its factorization.

111601601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 111601601 is about 10564.1658922984. The cubic root of 111601601 is about 481.4562272153.

Adding to 111601601 its reverse (106106111), we get a palindrome (217707712).

The spelling of 111601601 in words is "one hundred eleven million, six hundred one thousand, six hundred one".