4566721 has 2 divisors, whose sum is σ = 4566722.
Its totient is φ = 4566720.
The previous prime is 4566713. The next prime is 4566739. The reversal of 4566721 is 1276654.
It can be divided in two parts, 45 and 66721, that added together give a palindrome (66766).
It is a happy number.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 4562496 + 4225 = 2136^2 + 65^2
It is a cyclic number.
It is not a de Polignac number, because 4566721 - 23 = 4566713 is a prime.
It is not a weakly prime, because it can be changed into another prime (4566781) 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 as a sum of consecutive naturals, namely, 2283360 + 2283361.
It is an arithmetic number, because the mean of its divisors is an integer number (2283361).
Almost surely, 24566721 is an apocalyptic number.
It is an amenable number.
4566721 is a deficient number, since it is larger than the sum of its proper divisors (1).
4566721 is an equidigital number, since it uses as much as digits as its factorization.
4566721 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 10080, while the sum is 31.
The square root of 4566721 is about 2136.9887692733.
The cubic root of 4566721 is about 165.9083177864.
The spelling of 4566721 in words is "four million, five hundred sixty-six thousand, seven hundred twenty-one".