3621516621 has 4 divisors (see below), whose sum is σ = 4828688832. Its totient is φ = 2414344412.

The previous prime is 3621516611. The next prime is 3621516623. The reversal of 3621516621 is 1266151263.

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 a cyclic number.

It is not a de Polignac number, because 3621516621 - 2¹⁴ = 3621500237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3621516623) 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, 603586101 + ... + 603586106.

It is an arithmetic number, because the mean of its divisors is an integer number (1207172208).

Almost surely, 2^3621516621 is an apocalyptic number.

It is an amenable number.

3621516621 is a deficient number, since it is larger than the sum of its proper divisors (1207172211).

3621516621 is a wasteful number, since it uses less digits than its factorization.

3621516621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1207172210.

The product of its digits is 12960, while the sum is 33.

The square root of 3621516621 is about 60179.0380531294. The cubic root of 3621516621 is about 1535.6662071545. Note that the first 3 decimals are identical.

Adding to 3621516621 its reverse (1266151263), we get a palindrome (4887667884).

The spelling of 3621516621 in words is "three billion, six hundred twenty-one million, five hundred sixteen thousand, six hundred twenty-one".