111440809 has 2 divisors, whose sum is σ = 111440810. Its totient is φ = 111440808.

The previous prime is 111440803. The next prime is 111440827. The reversal of 111440809 is 908044111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92544400 + 18896409 = 9620^2 + 4347^2 .

It is a cyclic number.

It is not a de Polignac number, because 111440809 - 2³ = 111440801 is a prime.

It is not a weakly prime, because it can be changed into another prime (111440801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55720404 + 55720405.

It is an arithmetic number, because the mean of its divisors is an integer number (55720405).

Almost surely, 2^111440809 is an apocalyptic number.

It is an amenable number.

111440809 is a deficient number, since it is larger than the sum of its proper divisors (1).

111440809 is an equidigital number, since it uses as much as digits as its factorization.

111440809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 111440809 is about 10556.5528938191. The cubic root of 111440809 is about 481.2248938609.

The spelling of 111440809 in words is "one hundred eleven million, four hundred forty thousand, eight hundred nine".