1090109 has 8 divisors (see below), whose sum is σ = 1123320. Its totient is φ = 1057536.

The previous prime is 1090099. The next prime is 1090127. The reversal of 1090109 is 9010901.

It can be written as a sum of positive squares in 4 ways, for example, as 319225 + 770884 = 565^2 + 878^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1090109 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1090129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7889 + ... + 8025.

It is an arithmetic number, because the mean of its divisors is an integer number (140415).

2^1090109 is an apocalyptic number.

It is an amenable number.

1090109 is a deficient number, since it is larger than the sum of its proper divisors (33211).

1090109 is a wasteful number, since it uses less digits than its factorization.

1090109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319.

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 1090109 is about 1044.0828511186. The cubic root of 1090109 is about 102.9176770177.

The spelling of 1090109 in words is "one million, ninety thousand, one hundred nine".