2291665 has 4 divisors (see below), whose sum is σ = 2750004. Its totient is φ = 1833328.

The previous prime is 2291659. The next prime is 2291677. The reversal of 2291665 is 5661922.

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 1827904 + 463761 = 1352^2 + 681^2 .

It is a cyclic number.

It is not a de Polignac number, because 2291665 - 2³ = 2291657 is a prime.

It is a Smith number, since the sum of its digits (31) 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 an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 229162 + ... + 229171.

It is an arithmetic number, because the mean of its divisors is an integer number (687501).

2^2291665 is an apocalyptic number.

It is an amenable number.

2291665 is a deficient number, since it is larger than the sum of its proper divisors (458339).

2291665 is an equidigital number, since it uses as much as digits as its factorization.

2291665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458338.

The product of its digits is 6480, while the sum is 31.

The square root of 2291665 is about 1513.8246265668. The cubic root of 2291665 is about 131.8409662630.

The spelling of 2291665 in words is "two million, two hundred ninety-one thousand, six hundred sixty-five".