3621643 has 2 divisors, whose sum is σ = 3621644. Its totient is φ = 3621642.

The previous prime is 3621623. The next prime is 3621661. The reversal of 3621643 is 3461263.

3621643 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3621643 is a prime.

3621643 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (3621613) 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, 1810821 + 1810822.

It is an arithmetic number, because the mean of its divisors is an integer number (1810822).

Almost surely, 2^3621643 is an apocalyptic number.

3621643 is a deficient number, since it is larger than the sum of its proper divisors (1).

3621643 is an equidigital number, since it uses as much as digits as its factorization.

3621643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 25.

The square root of 3621643 is about 1903.0614808776. The cubic root of 3621643 is about 153.5684070177.

The spelling of 3621643 in words is "three million, six hundred twenty-one thousand, six hundred forty-three".