111409609 has 2 divisors, whose sum is σ = 111409610. Its totient is φ = 111409608.

The previous prime is 111409591. The next prime is 111409637. The reversal of 111409609 is 906904111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80640400 + 30769209 = 8980^2 + 5547^2 .

It is a cyclic number.

It is not a de Polignac number, because 111409609 - 2⁷ = 111409481 is a prime.

It is not a weakly prime, because it can be changed into another prime (111409679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55704804 + 55704805.

It is an arithmetic number, because the mean of its divisors is an integer number (55704805).

Almost surely, 2^111409609 is an apocalyptic number.

It is an amenable number.

111409609 is a deficient number, since it is larger than the sum of its proper divisors (1).

111409609 is an equidigital number, since it uses as much as digits as its factorization.

111409609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 111409609 is about 10555.0750352615. The cubic root of 111409609 is about 481.1799802779.

The spelling of 111409609 in words is "one hundred eleven million, four hundred nine thousand, six hundred nine".