5601721 has 8 divisors (see below), whose sum is σ = 5952744. Its totient is φ = 5253120.

The previous prime is 5601703. The next prime is 5601737. The reversal of 5601721 is 1271065.

It can be written as a sum of positive squares in 4 ways, for example, as 13225 + 5588496 = 115^2 + 2364^2 .

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 5601721 - 2⁷ = 5601593 is a prime.

It is a super-3 number, since 3×5601721³ (a number of 21 digits) contains 333 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5601692 and 5601701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5601781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6981 + ... + 7741.

It is an arithmetic number, because the mean of its divisors is an integer number (744093).

Almost surely, 2^5601721 is an apocalyptic number.

It is an amenable number.

5601721 is a deficient number, since it is larger than the sum of its proper divisors (351023).

5601721 is a wasteful number, since it uses less digits than its factorization.

5601721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1211.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 5601721 is about 2366.7955129246. The cubic root of 5601721 is about 177.5989899470.

Adding to 5601721 its reverse (1271065), we get a palindrome (6872786).

The spelling of 5601721 in words is "five million, six hundred one thousand, seven hundred twenty-one".