111611603 has 2 divisors, whose sum is σ = 111611604. Its totient is φ = 111611602.

The previous prime is 111611581. The next prime is 111611629. The reversal of 111611603 is 306116111.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111611603 - 2²⁰ = 110563027 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (111611803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55805801 + 55805802.

It is an arithmetic number, because the mean of its divisors is an integer number (55805802).

Almost surely, 2^111611603 is an apocalyptic number.

111611603 is a deficient number, since it is larger than the sum of its proper divisors (1).

111611603 is an equidigital number, since it uses as much as digits as its factorization.

111611603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 111611603 is about 10564.6392744854. The cubic root of 111611603 is about 481.4706098684.

Adding to 111611603 its reverse (306116111), we get a palindrome (417727714).

The spelling of 111611603 in words is "one hundred eleven million, six hundred eleven thousand, six hundred three".