3565721 has 2 divisors, whose sum is σ = 3565722. Its totient is φ = 3565720.

The previous prime is 3565697. The next prime is 3565739. The reversal of 3565721 is 1275653.

3565721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3463321 + 102400 = 1861^2 + 320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3565721 is a prime.

It is a Chen prime.

It is a plaindrome in base 16.

It is not a weakly prime, because it can be changed into another prime (3565741) 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, 1782860 + 1782861.

It is an arithmetic number, because the mean of its divisors is an integer number (1782861).

Almost surely, 2^3565721 is an apocalyptic number.

It is an amenable number.

3565721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3565721 is an equidigital number, since it uses as much as digits as its factorization.

3565721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6300, while the sum is 29.

The square root of 3565721 is about 1888.3116797817. The cubic root of 3565721 is about 152.7738838848.

It can be divided in two parts, 35 and 65721, that added together give a palindrome (65756).

The spelling of 3565721 in words is "three million, five hundred sixty-five thousand, seven hundred twenty-one".