4559721 has 4 divisors (see below), whose sum is σ = 6079632. Its totient is φ = 3039812.

The previous prime is 4559693. The next prime is 4559729. The reversal of 4559721 is 1279554.

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 4559721 - 2⁶ = 4559657 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (4559729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 759951 + ... + 759956.

It is an arithmetic number, because the mean of its divisors is an integer number (1519908).

Almost surely, 2^4559721 is an apocalyptic number.

It is an amenable number.

4559721 is a deficient number, since it is larger than the sum of its proper divisors (1519911).

4559721 is a wasteful number, since it uses less digits than its factorization.

4559721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1519910.

The product of its digits is 12600, while the sum is 33.

The square root of 4559721 is about 2135.3503225466. The cubic root of 4559721 is about 165.8235047723.

The spelling of 4559721 in words is "four million, five hundred fifty-nine thousand, seven hundred twenty-one".