8611621 has 4 divisors (see below), whose sum is σ = 8629792. Its totient is φ = 8593452.

The previous prime is 8611619. The next prime is 8611633. The reversal of 8611621 is 1261168.

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 8611621 - 2¹ = 8611619 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 (8611601) 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, 8355 + ... + 9328.

It is an arithmetic number, because the mean of its divisors is an integer number (2157448).

Almost surely, 2^8611621 is an apocalyptic number.

It is an amenable number.

8611621 is a deficient number, since it is larger than the sum of its proper divisors (18171).

8611621 is a wasteful number, since it uses less digits than its factorization.

8611621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18170.

The product of its digits is 576, while the sum is 25.

The square root of 8611621 is about 2934.5563548857. The cubic root of 8611621 is about 204.9722032507.

Adding to 8611621 its reverse (1261168), we get a palindrome (9872789).

The spelling of 8611621 in words is "eight million, six hundred eleven thousand, six hundred twenty-one".