581020681 has 2 divisors, whose sum is σ = 581020682. Its totient is φ = 581020680.

The previous prime is 581020639. The next prime is 581020697. The reversal of 581020681 is 186020185.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 580810000 + 210681 = 24100^2 + 459^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-581020681 is a prime.

It is a super-2 number, since 2×581020681² = 675170063499407522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (581020621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 290510340 + 290510341.

It is an arithmetic number, because the mean of its divisors is an integer number (290510341).

Almost surely, 2^581020681 is an apocalyptic number.

It is an amenable number.

581020681 is a deficient number, since it is larger than the sum of its proper divisors (1).

581020681 is an equidigital number, since it uses as much as digits as its factorization.

581020681 is an odious number, because the sum of its binary digits is odd.

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

The square root of 581020681 is about 24104.3705787975. The cubic root of 581020681 is about 834.4440014774. Note that the first 3 decimals are identical.

The spelling of 581020681 in words is "five hundred eighty-one million, twenty thousand, six hundred eighty-one".