8461581 has 4 divisors (see below), whose sum is σ = 11282112. Its totient is φ = 5641052.

The previous prime is 8461577. The next prime is 8461613. The reversal of 8461581 is 1851648.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8461581 - 2² = 8461577 is a prime.

It is a super-2 number, since 2×8461581² = 143196706039122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8461511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1410261 + ... + 1410266.

It is an arithmetic number, because the mean of its divisors is an integer number (2820528).

Almost surely, 2^8461581 is an apocalyptic number.

It is an amenable number.

8461581 is a deficient number, since it is larger than the sum of its proper divisors (2820531).

8461581 is a wasteful number, since it uses less digits than its factorization.

8461581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2820530.

The product of its digits is 7680, while the sum is 33.

The square root of 8461581 is about 2908.8796812519. The cubic root of 8461581 is about 203.7748139952.

The spelling of 8461581 in words is "eight million, four hundred sixty-one thousand, five hundred eighty-one".