534381241987561 has 2 divisors, whose sum is σ = 534381241987562. Its totient is φ = 534381241987560.

The previous prime is 534381241987391. The next prime is 534381241987573. The reversal of 534381241987561 is 165789142183435.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 352243679640336 + 182137562347225 = 18768156^2 + 13495835^2 .

It is a cyclic number.

It is not a de Polignac number, because 534381241987561 - 2⁹ = 534381241987049 is a prime.

It is not a weakly prime, because it can be changed into another prime (534381241987661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 267190620993780 + 267190620993781.

It is an arithmetic number, because the mean of its divisors is an integer number (267190620993781).

Almost surely, 2^{534381241987561} is an apocalyptic number.

It is an amenable number.

534381241987561 is a deficient number, since it is larger than the sum of its proper divisors (1).

534381241987561 is an equidigital number, since it uses as much as digits as its factorization.

534381241987561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174182400, while the sum is 67.

The spelling of 534381241987561 in words is "five hundred thirty-four trillion, three hundred eighty-one billion, two hundred forty-one million, nine hundred eighty-seven thousand, five hundred sixty-one".