111544009 has 2 divisors, whose sum is σ = 111544010. Its totient is φ = 111544008.

The previous prime is 111544007. The next prime is 111544031. The reversal of 111544009 is 900445111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108993600 + 2550409 = 10440^2 + 1597^2 .

It is a cyclic number.

It is not a de Polignac number, because 111544009 - 2¹ = 111544007 is a prime.

Together with 111544007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (111544007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55772004 + 55772005.

It is an arithmetic number, because the mean of its divisors is an integer number (55772005).

Almost surely, 2^111544009 is an apocalyptic number.

It is an amenable number.

111544009 is a deficient number, since it is larger than the sum of its proper divisors (1).

111544009 is an equidigital number, since it uses as much as digits as its factorization.

111544009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 111544009 is about 10561.4397219319. The cubic root of 111544009 is about 481.3733944786.

The spelling of 111544009 in words is "one hundred eleven million, five hundred forty-four thousand, nine".