2291645 has 6 divisors (see below), whose sum is σ = 2754042. Its totient is φ = 1830608.

The previous prime is 2291629. The next prime is 2291657. The reversal of 2291645 is 5461922.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1684804 + 606841 = 1298^2 + 779^2 .

It is not a de Polignac number, because 2291645 - 2⁴ = 2291629 is a prime.

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 5 ways as a sum of consecutive naturals, for example, 3047 + ... + 3723.

It is an arithmetic number, because the mean of its divisors is an integer number (459007).

2^2291645 is an apocalyptic number.

It is an amenable number.

2291645 is a deficient number, since it is larger than the sum of its proper divisors (462397).

2291645 is an frugal number, since it uses more digits than its factorization.

2291645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1359 (or 682 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 2291645 is about 1513.8180207674. The cubic root of 2291645 is about 131.8405827242.

The spelling of 2291645 in words is "two million, two hundred ninety-one thousand, six hundred forty-five".