5641721 has 8 divisors (see below), whose sum is σ = 5873664. Its totient is φ = 5412960.

The previous prime is 5641711. The next prime is 5641781. The reversal of 5641721 is 1271465.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5641721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5641711) 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, 3221 + ... + 4653.

It is an arithmetic number, because the mean of its divisors is an integer number (734208).

Almost surely, 2^5641721 is an apocalyptic number.

It is an amenable number.

5641721 is a deficient number, since it is larger than the sum of its proper divisors (231943).

5641721 is a wasteful number, since it uses less digits than its factorization.

5641721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1591.

The product of its digits is 1680, while the sum is 26.

The square root of 5641721 is about 2375.2307256349. The cubic root of 5641721 is about 178.0207125668.

The spelling of 5641721 in words is "five million, six hundred forty-one thousand, seven hundred twenty-one".