281085490886989 has 2 divisors, whose sum is σ = 281085490886990. Its totient is φ = 281085490886988.

The previous prime is 281085490886933. The next prime is 281085490887043. The reversal of 281085490886989 is 989688094580182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165452395608900 + 115633095278089 = 12862830^2 + 10753283^2 .

It is a cyclic number.

It is not a de Polignac number, because 281085490886989 - 2¹⁵ = 281085490854221 is a prime.

It is a super-2 number, since 2×281085490886989² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281085490826989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140542745443494 + 140542745443495.

It is an arithmetic number, because the mean of its divisors is an integer number (140542745443495).

Almost surely, 2^{281085490886989} is an apocalyptic number.

It is an amenable number.

281085490886989 is a deficient number, since it is larger than the sum of its proper divisors (1).

281085490886989 is an equidigital number, since it uses as much as digits as its factorization.

281085490886989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5733089280, while the sum is 85.

The spelling of 281085490886989 in words is "two hundred eighty-one trillion, eighty-five billion, four hundred ninety million, eight hundred eighty-six thousand, nine hundred eighty-nine".