8612581 has 2 divisors, whose sum is σ = 8612582. Its totient is φ = 8612580.

The previous prime is 8612531. The next prime is 8612627. The reversal of 8612581 is 1852168.

8612581 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., 8608356 + 4225 = 2934^2 + 65^2 .

It is a cyclic number.

It is not a de Polignac number, because 8612581 - 2¹⁷ = 8481509 is a prime.

It is a super-2 number, since 2×8612581² = 148353102963122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8612531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4306290 + 4306291.

It is an arithmetic number, because the mean of its divisors is an integer number (4306291).

Almost surely, 2^8612581 is an apocalyptic number.

It is an amenable number.

8612581 is a deficient number, since it is larger than the sum of its proper divisors (1).

8612581 is an equidigital number, since it uses as much as digits as its factorization.

8612581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 31.

The square root of 8612581 is about 2934.7199184931. The cubic root of 8612581 is about 204.9798195483.

The spelling of 8612581 in words is "eight million, six hundred twelve thousand, five hundred eighty-one".