581261146889 has 2 divisors, whose sum is σ = 581261146890. Its totient is φ = 581261146888.

The previous prime is 581261146861. The next prime is 581261146897. The reversal of 581261146889 is 988641162185.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 358729123600 + 222532023289 = 598940^2 + 471733^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-581261146889 is a prime.

It is not a weakly prime, because it can be changed into another prime (581261146849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 290630573444 + 290630573445.

It is an arithmetic number, because the mean of its divisors is an integer number (290630573445).

Almost surely, 2^581261146889 is an apocalyptic number.

It is an amenable number.

581261146889 is a deficient number, since it is larger than the sum of its proper divisors (1).

581261146889 is an equidigital number, since it uses as much as digits as its factorization.

581261146889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6635520, while the sum is 59.

The spelling of 581261146889 in words is "five hundred eighty-one billion, two hundred sixty-one million, one hundred forty-six thousand, eight hundred eighty-nine".