8581861 has 2 divisors, whose sum is σ = 8581862. Its totient is φ = 8581860.

The previous prime is 8581847. The next prime is 8581927. The reversal of 8581861 is 1681858.

8581861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5377761 + 3204100 = 2319^2 + 1790^2 .

It is a cyclic number.

It is not a de Polignac number, because 8581861 - 2⁷ = 8581733 is a prime.

8581861 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 8581861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8581961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4290930 + 4290931.

It is an arithmetic number, because the mean of its divisors is an integer number (4290931).

Almost surely, 2^8581861 is an apocalyptic number.

It is an amenable number.

8581861 is a deficient number, since it is larger than the sum of its proper divisors (1).

8581861 is an equidigital number, since it uses as much as digits as its factorization.

8581861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15360, while the sum is 37.

The square root of 8581861 is about 2929.4813534139. The cubic root of 8581861 is about 204.7358167430.

The spelling of 8581861 in words is "eight million, five hundred eighty-one thousand, eight hundred sixty-one".