2164565 has 8 divisors (see below), whose sum is σ = 2797368. Its totient is φ = 1598400.

The previous prime is 2164529. The next prime is 2164571. The reversal of 2164565 is 5654612.

It can be written as a sum of positive squares in 4 ways, for example, as 96721 + 2067844 = 311^2 + 1438^2 .

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

It is not a de Polignac number, because 2164565 - 2⁶ = 2164501 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 7 ways as a sum of consecutive naturals, for example, 16586 + ... + 16715.

It is an arithmetic number, because the mean of its divisors is an integer number (349671).

2^2164565 is an apocalyptic number.

It is an amenable number.

2164565 is a deficient number, since it is larger than the sum of its proper divisors (632803).

2164565 is a wasteful number, since it uses less digits than its factorization.

2164565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33319.

The product of its digits is 7200, while the sum is 29.

The square root of 2164565 is about 1471.2460705130. The cubic root of 2164565 is about 129.3570820868.

The spelling of 2164565 in words is "two million, one hundred sixty-four thousand, five hundred sixty-five".