2164639 has 2 divisors, whose sum is σ = 2164640. Its totient is φ = 2164638.

The previous prime is 2164633. The next prime is 2164681. The reversal of 2164639 is 9364612.

2164639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2164639 - 2⁵ = 2164607 is a prime.

It is a Chen prime.

2164639 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2164639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2164633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082319 + 1082320.

It is an arithmetic number, because the mean of its divisors is an integer number (1082320).

2^2164639 is an apocalyptic number.

2164639 is a deficient number, since it is larger than the sum of its proper divisors (1).

2164639 is an equidigital number, since it uses as much as digits as its factorization.

2164639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 31.

The square root of 2164639 is about 1471.2712190483. The cubic root of 2164639 is about 129.3585561806.

The spelling of 2164639 in words is "two million, one hundred sixty-four thousand, six hundred thirty-nine".