111623609 has 2 divisors, whose sum is σ = 111623610. Its totient is φ = 111623608.

The previous prime is 111623593. The next prime is 111623719. The reversal of 111623609 is 906326111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111239209 + 384400 = 10547^2 + 620^2 .

It is a cyclic number.

It is not a de Polignac number, because 111623609 - 2⁴ = 111623593 is a prime.

It is not a weakly prime, because it can be changed into another prime (111623509) 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, 55811804 + 55811805.

It is an arithmetic number, because the mean of its divisors is an integer number (55811805).

Almost surely, 2^111623609 is an apocalyptic number.

It is an amenable number.

111623609 is a deficient number, since it is larger than the sum of its proper divisors (1).

111623609 is an equidigital number, since it uses as much as digits as its factorization.

111623609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 111623609 is about 10565.2074754829. The cubic root of 111623609 is about 481.4878730941.

The spelling of 111623609 in words is "one hundred eleven million, six hundred twenty-three thousand, six hundred nine".