1118809 has 2 divisors, whose sum is σ = 1118810. Its totient is φ = 1118808.

The previous prime is 1118807. The next prime is 1118827. The reversal of 1118809 is 9088111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1108809 + 10000 = 1053^2 + 100^2 .

It is a cyclic number.

It is not a de Polignac number, because 1118809 - 2¹ = 1118807 is a prime.

Together with 1118807, it forms a pair of twin primes.

It is a plaindrome in base 16.

It is not a weakly prime, because it can be changed into another prime (1118807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 559404 + 559405.

It is an arithmetic number, because the mean of its divisors is an integer number (559405).

2^1118809 is an apocalyptic number.

It is an amenable number.

1118809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1118809 is an equidigital number, since it uses as much as digits as its factorization.

1118809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 28.

The square root of 1118809 is about 1057.7376801457. The cubic root of 1118809 is about 103.8130579068.

The spelling of 1118809 in words is "one million, one hundred eighteen thousand, eight hundred nine".