2164549 has 4 divisors (see below), whose sum is σ = 2168236. Its totient is φ = 2160864.

The previous prime is 2164529. The next prime is 2164571. The reversal of 2164549 is 9454612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1979649 + 184900 = 1407^2 + 430^2 .

It is a cyclic number.

It is not a de Polignac number, because 2164549 - 2⁹ = 2164037 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 2164549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2164529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 744 + ... + 2209.

It is an arithmetic number, because the mean of its divisors is an integer number (542059).

2^2164549 is an apocalyptic number.

It is an amenable number.

2164549 is a deficient number, since it is larger than the sum of its proper divisors (3687).

2164549 is an equidigital number, since it uses as much as digits as its factorization.

2164549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3686.

The product of its digits is 8640, while the sum is 31.

The square root of 2164549 is about 1471.2406329353. The cubic root of 2164549 is about 129.3567633595.

The spelling of 2164549 in words is "two million, one hundred sixty-four thousand, five hundred forty-nine".