8613421 has 2 divisors, whose sum is σ = 8613422. Its totient is φ = 8613420.

The previous prime is 8613391. The next prime is 8613427. The reversal of 8613421 is 1243168.

8613421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4888521 + 3724900 = 2211^2 + 1930^2 .

It is a cyclic number.

It is not a de Polignac number, because 8613421 - 2¹³ = 8605229 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8613427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4306710 + 4306711.

It is an arithmetic number, because the mean of its divisors is an integer number (4306711).

Almost surely, 2^8613421 is an apocalyptic number.

It is an amenable number.

8613421 is a deficient number, since it is larger than the sum of its proper divisors (1).

8613421 is an equidigital number, since it uses as much as digits as its factorization.

8613421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 25.

The square root of 8613421 is about 2934.8630291719. The cubic root of 8613421 is about 204.9864833444.

Adding to 8613421 its reverse (1243168), we get a palindrome (9856589).

The spelling of 8613421 in words is "eight million, six hundred thirteen thousand, four hundred twenty-one".