4572721 has 2 divisors, whose sum is σ = 4572722. Its totient is φ = 4572720.

The previous prime is 4572709. The next prime is 4572727. The reversal of 4572721 is 1272754.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3045025 + 1527696 = 1745^2 + 1236^2 .

It is a cyclic number.

It is not a de Polignac number, because 4572721 - 2¹⁹ = 4048433 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4572721.

It is not a weakly prime, because it can be changed into another prime (4572727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2286360 + 2286361.

It is an arithmetic number, because the mean of its divisors is an integer number (2286361).

Almost surely, 2^4572721 is an apocalyptic number.

It is an amenable number.

4572721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4572721 is an equidigital number, since it uses as much as digits as its factorization.

4572721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3920, while the sum is 28.

The square root of 4572721 is about 2138.3921529972. The cubic root of 4572721 is about 165.9809457009.

The spelling of 4572721 in words is "four million, five hundred seventy-two thousand, seven hundred twenty-one".