581661461 has 2 divisors, whose sum is σ = 581661462. Its totient is φ = 581661460.

The previous prime is 581661449. The next prime is 581661517. The reversal of 581661461 is 164166185.

581661461 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 437060836 + 144600625 = 20906^2 + 12025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-581661461 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (581621461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 290830730 + 290830731.

It is an arithmetic number, because the mean of its divisors is an integer number (290830731).

Almost surely, 2^581661461 is an apocalyptic number.

It is an amenable number.

581661461 is a deficient number, since it is larger than the sum of its proper divisors (1).

581661461 is an equidigital number, since it uses as much as digits as its factorization.

581661461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 38.

The square root of 581661461 is about 24117.6586964821. The cubic root of 581661461 is about 834.7506449423.

The spelling of 581661461 in words is "five hundred eighty-one million, six hundred sixty-one thousand, four hundred sixty-one".