2165653 has 12 divisors (see below), whose sum is σ = 2543340. Its totient is φ = 1838592.

The previous prime is 2165651. The next prime is 2165659. The reversal of 2165653 is 3565612.

It can be written as a sum of positive squares in 2 ways, for example, as 1350244 + 815409 = 1162^2 + 903^2 .

It is not a de Polignac number, because 2165653 - 2¹ = 2165651 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9343 + ... + 9571.

It is an arithmetic number, because the mean of its divisors is an integer number (211945).

2^2165653 is an apocalyptic number.

It is an amenable number.

2165653 is a deficient number, since it is larger than the sum of its proper divisors (377687).

2165653 is a wasteful number, since it uses less digits than its factorization.

2165653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436 (or 429 counting only the distinct ones).

The product of its digits is 5400, while the sum is 28.

The square root of 2165653 is about 1471.6157786596. The cubic root of 2165653 is about 129.3787518652.

The spelling of 2165653 in words is "two million, one hundred sixty-five thousand, six hundred fifty-three".