5649 has 8 divisors (see below), whose sum is σ = 8640. Its totient is φ = 3216.

The previous prime is 5647. The next prime is 5651. The reversal of 5649 is 9465.

It is an interprime number because it is at equal distance from previous prime (5647) and next prime (5651).

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

It is not a de Polignac number, because 5649 - 2¹ = 5647 is a prime.

It is a super-2 number, since 2×5649² = 63822402, which contains 22 as substring.

It is a Curzon number.

5649 is a lucky number.

It is a nialpdrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (5641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114 + ... + 155.

It is an arithmetic number, because the mean of its divisors is an integer number (1080).

2⁵⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

5649 is a deficient number, since it is larger than the sum of its proper divisors (2991).

5649 is a wasteful number, since it uses less digits than its factorization.

5649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279.

The product of its digits is 1080, while the sum is 24.

The square root of 5649 is about 75.1598296965. The cubic root of 5649 is about 17.8097240981.

Subtracting from 5649 its sum of digits (24), we obtain a square (5625 = 75²).

It can be divided in two parts, 56 and 49, that multiplied together give a cube (2744 = 14³).

The spelling of 5649 in words is "five thousand, six hundred forty-nine".