111001609 has 2 divisors, whose sum is σ = 111001610. Its totient is φ = 111001608.

The previous prime is 111001577. The next prime is 111001621. The reversal of 111001609 is 906100111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68425984 + 42575625 = 8272^2 + 6525^2 .

It is a cyclic number.

It is not a de Polignac number, because 111001609 - 2⁵ = 111001577 is a prime.

It is not a weakly prime, because it can be changed into another prime (111001679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55500804 + 55500805.

It is an arithmetic number, because the mean of its divisors is an integer number (55500805).

Almost surely, 2^111001609 is an apocalyptic number.

It is an amenable number.

111001609 is a deficient number, since it is larger than the sum of its proper divisors (1).

111001609 is an equidigital number, since it uses as much as digits as its factorization.

111001609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 19.

The square root of 111001609 is about 10535.7301123368. The cubic root of 111001609 is about 480.5918754872.

The spelling of 111001609 in words is "one hundred eleven million, one thousand, six hundred nine".