581864481 has 12 divisors (see below), whose sum is σ = 916877520. Its totient is φ = 352645080.

The previous prime is 581864477. The next prime is 581864483. The reversal of 581864481 is 184468185.

581864481 is a `hidden beast` number, since 581 + 8 + 64 + 4 + 8 + 1 = 666.

It is not a de Polignac number, because 581864481 - 2² = 581864477 is a prime.

It is a super-2 number, since 2×581864481² = 677132548498798722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (581864483) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2938611 + ... + 2938808.

It is an arithmetic number, because the mean of its divisors is an integer number (76406460).

Almost surely, 2^581864481 is an apocalyptic number.

It is an amenable number.

581864481 is a deficient number, since it is larger than the sum of its proper divisors (335013039).

581864481 is a wasteful number, since it uses less digits than its factorization.

581864481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5877436 (or 5877433 counting only the distinct ones).

The product of its digits is 245760, while the sum is 45.

The square root of 581864481 is about 24121.8672784675. The cubic root of 581864481 is about 834.8477526095.

The spelling of 581864481 in words is "five hundred eighty-one million, eight hundred sixty-four thousand, four hundred eighty-one".