3565021 has 2 divisors, whose sum is σ = 3565022. Its totient is φ = 3565020.

The previous prime is 3565013. The next prime is 3565039. The reversal of 3565021 is 1205653.

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., 3496900 + 68121 = 1870^2 + 261^2 .

It is an emirp because it is prime and its reverse (1205653) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3565021 - 2³ = 3565013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3564983 and 3565001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3565321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1782510 + 1782511.

It is an arithmetic number, because the mean of its divisors is an integer number (1782511).

Almost surely, 2^3565021 is an apocalyptic number.

It is an amenable number.

3565021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3565021 is an equidigital number, since it uses as much as digits as its factorization.

3565021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 3565021 is about 1888.1263199267. The cubic root of 3565021 is about 152.7638860268.

It can be divided in two parts, 35 and 65021, that added together give a palindrome (65056).

The spelling of 3565021 in words is "three million, five hundred sixty-five thousand, twenty-one".