2163649 has 4 divisors (see below), whose sum is σ = 2222164. Its totient is φ = 2105136.

The previous prime is 2163613. The next prime is 2163653. The reversal of 2163649 is 9463612.

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 1803649 + 360000 = 1343^2 + 600^2 .

It is a cyclic number.

It is not a de Polignac number, because 2163649 - 2⁹ = 2163137 is a prime.

It is a d-powerful number, because it can be written as 2²¹ + 1 + 6 + 3⁶ + 6³ + 4⁸ + 9 .

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 2163649.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2163349) 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 3 ways as a sum of consecutive naturals, for example, 29202 + ... + 29275.

It is an arithmetic number, because the mean of its divisors is an integer number (555541).

2^2163649 is an apocalyptic number.

It is an amenable number.

2163649 is a deficient number, since it is larger than the sum of its proper divisors (58515).

2163649 is an equidigital number, since it uses as much as digits as its factorization.

2163649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58514.

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

The square root of 2163649 is about 1470.9347368255. The cubic root of 2163649 is about 129.3388324146.

The spelling of 2163649 in words is "two million, one hundred sixty-three thousand, six hundred forty-nine".