2164649 has 4 divisors (see below), whose sum is σ = 2175120. Its totient is φ = 2154180.

The previous prime is 2164639. The next prime is 2164681. The reversal of 2164649 is 9464612.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2164649 - 2⁴ = 2164633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2164609) 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, 4919 + ... + 5340.

It is an arithmetic number, because the mean of its divisors is an integer number (543780).

2^2164649 is an apocalyptic number.

It is an amenable number.

2164649 is a deficient number, since it is larger than the sum of its proper divisors (10471).

2164649 is a wasteful number, since it uses less digits than its factorization.

2164649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10470.

The product of its digits is 10368, while the sum is 32.

The square root of 2164649 is about 1471.2746174661. The cubic root of 2164649 is about 129.3587553798.

The spelling of 2164649 in words is "two million, one hundred sixty-four thousand, six hundred forty-nine".