3631621 has 4 divisors (see below), whose sum is σ = 4150432. Its totient is φ = 3112812.

The previous prime is 3631609. The next prime is 3631633. The reversal of 3631621 is 1261363.

3631621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (3631609) and next prime (3631633).

It is a cyclic number.

It is not a de Polignac number, because 3631621 - 2¹⁹ = 3107333 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3631592 and 3631601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3631321) 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 3 ways as a sum of consecutive naturals, for example, 259395 + ... + 259408.

It is an arithmetic number, because the mean of its divisors is an integer number (1037608).

Almost surely, 2^3631621 is an apocalyptic number.

It is an amenable number.

3631621 is a deficient number, since it is larger than the sum of its proper divisors (518811).

3631621 is an equidigital number, since it uses as much as digits as its factorization.

3631621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518810.

The product of its digits is 648, while the sum is 22.

The square root of 3631621 is about 1905.6812430205. The cubic root of 3631621 is about 153.7093099629.

Adding to 3631621 its reverse (1261363), we get a palindrome (4892984).

The spelling of 3631621 in words is "three million, six hundred thirty-one thousand, six hundred twenty-one".