8189581 has 2 divisors, whose sum is σ = 8189582. Its totient is φ = 8189580.

The previous prime is 8189579. The next prime is 8189593. The reversal of 8189581 is 1859818.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8122500 + 67081 = 2850^2 + 259^2 .

It is a cyclic number.

It is not a de Polignac number, because 8189581 - 2¹ = 8189579 is a prime.

It is a super-2 number, since 2×8189581² = 134138473911122, which contains 22 as substring.

Together with 8189579, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8189501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4094790 + 4094791.

It is an arithmetic number, because the mean of its divisors is an integer number (4094791).

Almost surely, 2^8189581 is an apocalyptic number.

It is an amenable number.

8189581 is a deficient number, since it is larger than the sum of its proper divisors (1).

8189581 is an equidigital number, since it uses as much as digits as its factorization.

8189581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 40.

The square root of 8189581 is about 2861.7443980901. The cubic root of 8189581 is about 201.5675239138.

The spelling of 8189581 in words is "eight million, one hundred eighty-nine thousand, five hundred eighty-one".