8611821 has 12 divisors (see below), whose sum is σ = 12980448. Its totient is φ = 5491464.

The previous prime is 8611819. The next prime is 8611829. The reversal of 8611821 is 1281168.

It is not a de Polignac number, because 8611821 - 2¹ = 8611819 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8611829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20595 + ... + 21008.

It is an arithmetic number, because the mean of its divisors is an integer number (1081704).

Almost surely, 2^8611821 is an apocalyptic number.

It is an amenable number.

8611821 is a deficient number, since it is larger than the sum of its proper divisors (4368627).

8611821 is a wasteful number, since it uses less digits than its factorization.

8611821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41632 (or 41629 counting only the distinct ones).

The product of its digits is 768, while the sum is 27.

The square root of 8611821 is about 2934.5904313890. The cubic root of 8611821 is about 204.9737900261.

Adding to 8611821 its reverse (1281168), we get a palindrome (9892989).

The spelling of 8611821 in words is "eight million, six hundred eleven thousand, eight hundred twenty-one".