4569721 has 4 divisors (see below), whose sum is σ = 4921252. Its totient is φ = 4218192.

The previous prime is 4569703. The next prime is 4569743. The reversal of 4569721 is 1279654.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 810000 + 3759721 = 900^2 + 1939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4569721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4569701) 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 3 ways as a sum of consecutive naturals, for example, 175746 + ... + 175771.

It is an arithmetic number, because the mean of its divisors is an integer number (1230313).

Almost surely, 2^4569721 is an apocalyptic number.

It is an amenable number.

4569721 is a deficient number, since it is larger than the sum of its proper divisors (351531).

4569721 is a wasteful number, since it uses less digits than its factorization.

4569721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351530.

The product of its digits is 15120, while the sum is 34.

The square root of 4569721 is about 2137.6905762996. The cubic root of 4569721 is about 165.9446396903.

The spelling of 4569721 in words is "four million, five hundred sixty-nine thousand, seven hundred twenty-one".