2291605 has 8 divisors (see below), whose sum is σ = 2869632. Its totient is φ = 1753488.

The previous prime is 2291591. The next prime is 2291623. The reversal of 2291605 is 5061922.

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

It is a cyclic number.

It is not a de Polignac number, because 2291605 - 2⁵ = 2291573 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2291605.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 9849 + ... + 10078.

It is an arithmetic number, because the mean of its divisors is an integer number (358704).

2^2291605 is an apocalyptic number.

It is an amenable number.

2291605 is a deficient number, since it is larger than the sum of its proper divisors (578027).

2291605 is a wasteful number, since it uses less digits than its factorization.

2291605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19955.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 2291605 is about 1513.8048090821. The cubic root of 2291605 is about 131.8398156400.

The spelling of 2291605 in words is "two million, two hundred ninety-one thousand, six hundred five".