3621651 has 16 divisors (see below), whose sum is σ = 5317248. Its totient is φ = 2192520.

The previous prime is 3621643. The next prime is 3621661. The reversal of 3621651 is 1561263.

3621651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3621651 - 2³ = 3621643 is a prime.

3621651 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3621661) 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 in 15 ways as a sum of consecutive naturals, for example, 3540 + ... + 4446.

It is an arithmetic number, because the mean of its divisors is an integer number (332328).

Almost surely, 2^3621651 is an apocalyptic number.

3621651 is a deficient number, since it is larger than the sum of its proper divisors (1695597).

3621651 is an equidigital number, since it uses as much as digits as its factorization.

3621651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943 (or 921 counting only the distinct ones).

The product of its digits is 1080, while the sum is 24.

The square root of 3621651 is about 1903.0635827528. The cubic root of 3621651 is about 153.5685200922.

The spelling of 3621651 in words is "three million, six hundred twenty-one thousand, six hundred fifty-one".