4451721 has 4 divisors (see below), whose sum is σ = 5935632. Its totient is φ = 2967812.

The previous prime is 4451701. The next prime is 4451723. The reversal of 4451721 is 1271544.

4451721 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4451721 - 2⁷ = 4451593 is a prime.

It is a D-number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 4451691 and 4451700.

It is not an unprimeable number, because it can be changed into a prime (4451723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 741951 + ... + 741956.

It is an arithmetic number, because the mean of its divisors is an integer number (1483908).

Almost surely, 2^4451721 is an apocalyptic number.

It is an amenable number.

4451721 is a deficient number, since it is larger than the sum of its proper divisors (1483911).

4451721 is a wasteful number, since it uses less digits than its factorization.

4451721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1483910.

The product of its digits is 1120, while the sum is 24.

The square root of 4451721 is about 2109.9101876620. The cubic root of 4451721 is about 164.5038170109.

It can be divided in two parts, 4 and 451721, that added together give a triangular number (451725 = T₉₅₀).

The spelling of 4451721 in words is "four million, four hundred fifty-one thousand, seven hundred twenty-one".