2163505 has 8 divisors (see below), whose sum is σ = 2749032. Its totient is φ = 1628928.

The previous prime is 2163503. The next prime is 2163509. The reversal of 2163505 is 5053612.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 431649 + 1731856 = 657^2 + 1316^2 .

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 2163505 - 2¹ = 2163503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2163503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12642 + ... + 12811.

It is an arithmetic number, because the mean of its divisors is an integer number (343629).

2^2163505 is an apocalyptic number.

It is an amenable number.

2163505 is a deficient number, since it is larger than the sum of its proper divisors (585527).

2163505 is a wasteful number, since it uses less digits than its factorization.

2163505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25475.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 2163505 is about 1470.8857875444. The cubic root of 2163505 is about 129.3359630020.

It can be divided in two parts, 216 and 3505, that added together give a square (3721 = 61²).

The spelling of 2163505 in words is "two million, one hundred sixty-three thousand, five hundred five".