581609081 has 2 divisors, whose sum is σ = 581609082. Its totient is φ = 581609080.

The previous prime is 581609069. The next prime is 581609087. The reversal of 581609081 is 180906185.

581609081 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., 512569600 + 69039481 = 22640^2 + 8309^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-581609081 is a prime.

It is a super-2 number, since 2×581609081² = 676538246203329122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (581609087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 290804540 + 290804541.

It is an arithmetic number, because the mean of its divisors is an integer number (290804541).

Almost surely, 2^581609081 is an apocalyptic number.

It is an amenable number.

581609081 is a deficient number, since it is larger than the sum of its proper divisors (1).

581609081 is an equidigital number, since it uses as much as digits as its factorization.

581609081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 581609081 is about 24116.5727457282. The cubic root of 581609081 is about 834.7255870955.

The spelling of 581609081 in words is "five hundred eighty-one million, six hundred nine thousand, eighty-one".