8105621 has 2 divisors, whose sum is σ = 8105622. Its totient is φ = 8105620.

The previous prime is 8105599. The next prime is 8105633. The reversal of 8105621 is 1265018.

8105621 is digitally balanced in base 3, 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., 8008900 + 96721 = 2830^2 + 311^2 .

It is a cyclic number.

It is not a de Polignac number, because 8105621 - 2⁶ = 8105557 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8105021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4052810 + 4052811.

It is an arithmetic number, because the mean of its divisors is an integer number (4052811).

Almost surely, 2^8105621 is an apocalyptic number.

It is an amenable number.

8105621 is a deficient number, since it is larger than the sum of its proper divisors (1).

8105621 is an equidigital number, since it uses as much as digits as its factorization.

8105621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 8105621 is about 2847.0372319308. The cubic root of 8105621 is about 200.8763296238.

The spelling of 8105621 in words is "eight million, one hundred five thousand, six hundred twenty-one".