3623206621 has 4 divisors (see below), whose sum is σ = 3628842112. Its totient is φ = 3617571132.

The previous prime is 3623206597. The next prime is 3623206667. The reversal of 3623206621 is 1266023263.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1266023263 = 17509 ⋅72307.

It is a cyclic number.

It is not a de Polignac number, because 3623206621 - 2¹⁷ = 3623075549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3623206681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2816781 + ... + 2818066.

It is an arithmetic number, because the mean of its divisors is an integer number (907210528).

Almost surely, 2^3623206621 is an apocalyptic number.

It is an amenable number.

3623206621 is a deficient number, since it is larger than the sum of its proper divisors (5635491).

3623206621 is an equidigital number, since it uses as much as digits as its factorization.

3623206621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5635490.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 3623206621 is about 60193.0778495335. The cubic root of 3623206621 is about 1535.9050456087.

Adding to 3623206621 its reverse (1266023263), we get a palindrome (4889229884).

The spelling of 3623206621 in words is "three billion, six hundred twenty-three million, two hundred six thousand, six hundred twenty-one".