6001721 has 12 divisors (see below), whose sum is σ = 6656916. Its totient is φ = 5406720.

The previous prime is 6001717. The next prime is 6001727. The reversal of 6001721 is 1271006.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4141225 + 1860496 = 2035^2 + 1364^2 .

It is not a de Polignac number, because 6001721 - 2² = 6001717 is a prime.

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 6001721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6001727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23225 + ... + 23481.

It is an arithmetic number, because the mean of its divisors is an integer number (554743).

Almost surely, 2^6001721 is an apocalyptic number.

It is an amenable number.

6001721 is a deficient number, since it is larger than the sum of its proper divisors (655195).

6001721 is a wasteful number, since it uses less digits than its factorization.

6001721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472 (or 461 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 6001721 is about 2449.8410152498. The cubic root of 6001721 is about 181.7294313143.

Adding to 6001721 its reverse (1271006), we get a palindrome (7272727).

The spelling of 6001721 in words is "six million, one thousand, seven hundred twenty-one".