8221613 has 4 divisors (see below), whose sum is σ = 8231808. Its totient is φ = 8211420.

The previous prime is 8221597. The next prime is 8221621. The reversal of 8221613 is 3161228.

8221613 is digitally balanced in base 3, 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 a cyclic number.

It is not a de Polignac number, because 8221613 - 2⁴ = 8221597 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 (8221313) 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, 3773 + ... + 5538.

It is an arithmetic number, because the mean of its divisors is an integer number (2057952).

Almost surely, 2^8221613 is an apocalyptic number.

It is an amenable number.

8221613 is a deficient number, since it is larger than the sum of its proper divisors (10195).

8221613 is an equidigital number, since it uses as much as digits as its factorization.

8221613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10194.

The product of its digits is 576, while the sum is 23.

The square root of 8221613 is about 2867.3355227458. The cubic root of 8221613 is about 201.8299798006.

The spelling of 8221613 in words is "eight million, two hundred twenty-one thousand, six hundred thirteen".