5644991 has 8 divisors (see below), whose sum is σ = 6220368. Its totient is φ = 5080000.

The previous prime is 5644987. The next prime is 5644993. The reversal of 5644991 is 1994465.

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

It is a cyclic number.

It is not a de Polignac number, because 5644991 - 2² = 5644987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5644993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1430 + ... + 3651.

It is an arithmetic number, because the mean of its divisors is an integer number (777546).

Almost surely, 2^5644991 is an apocalyptic number.

5644991 is a deficient number, since it is larger than the sum of its proper divisors (575377).

5644991 is a wasteful number, since it uses less digits than its factorization.

5644991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5193.

The product of its digits is 38880, while the sum is 38.

The square root of 5644991 is about 2375.9189801001. The cubic root of 5644991 is about 178.0551001409.

It can be divided in two parts, 564 and 4991, that added together give a palindrome (5555).

The spelling of 5644991 in words is "five million, six hundred forty-four thousand, nine hundred ninety-one".