1801165 has 4 divisors (see below), whose sum is σ = 2161404. Its totient is φ = 1440928.

The previous prime is 1801117. The next prime is 1801187. The reversal of 1801165 is 5611081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 842724 + 958441 = 918^2 + 979^2 .

It is a cyclic number.

It is not a de Polignac number, because 1801165 - 2¹¹ = 1799117 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180112 + ... + 180121.

It is an arithmetic number, because the mean of its divisors is an integer number (540351).

2^1801165 is an apocalyptic number.

It is an amenable number.

1801165 is a deficient number, since it is larger than the sum of its proper divisors (360239).

1801165 is an equidigital number, since it uses as much as digits as its factorization.

1801165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360238.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 1801165 is about 1342.0748861371. The cubic root of 1801165 is about 121.6702778270.

The spelling of 1801165 in words is "one million, eight hundred one thousand, one hundred sixty-five".