1109869 has 2 divisors, whose sum is σ = 1109870. Its totient is φ = 1109868.

The previous prime is 1109861. The next prime is 1109881. The reversal of 1109869 is 9689011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 660969 + 448900 = 813^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 1109869 - 2³ = 1109861 is a prime.

It is a super-2 number, since 2×1109869² = 2463618394322, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1109861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 554934 + 554935.

It is an arithmetic number, because the mean of its divisors is an integer number (554935).

2^1109869 is an apocalyptic number.

It is an amenable number.

1109869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1109869 is an equidigital number, since it uses as much as digits as its factorization.

1109869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1109869 is about 1053.5032036022. The cubic root of 1109869 is about 103.5358071941.

The spelling of 1109869 in words is "one million, one hundred nine thousand, eight hundred sixty-nine".