3565921 has 2 divisors, whose sum is σ = 3565922. Its totient is φ = 3565920.

The previous prime is 3565909. The next prime is 3565931. The reversal of 3565921 is 1295653.

3565921 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., 1904400 + 1661521 = 1380^2 + 1289^2 .

It is an emirp because it is prime and its reverse (1295653) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3565921 - 2⁵ = 3565889 is a prime.

It is not a weakly prime, because it can be changed into another prime (3565931) 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, 1782960 + 1782961.

It is an arithmetic number, because the mean of its divisors is an integer number (1782961).

Almost surely, 2^3565921 is an apocalyptic number.

It is an amenable number.

3565921 is a deficient number, since it is larger than the sum of its proper divisors (1).

3565921 is an equidigital number, since it uses as much as digits as its factorization.

3565921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8100, while the sum is 31.

The square root of 3565921 is about 1888.3646363984. The cubic root of 3565921 is about 152.7767401754.

It can be divided in two parts, 35 and 65921, that added together give a palindrome (65956).

The spelling of 3565921 in words is "three million, five hundred sixty-five thousand, nine hundred twenty-one".