159841681 has 2 divisors, whose sum is σ = 159841682. Its totient is φ = 159841680.

The previous prime is 159841639. The next prime is 159841709. The reversal of 159841681 is 186148951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141991056 + 17850625 = 11916^2 + 4225^2 .

It is an emirp because it is prime and its reverse (186148951) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 159841681 - 2⁷ = 159841553 is a prime.

It is a super-2 number, since 2×159841681² = 51098725969811522, which contains 22 as substring.

It is equal to p_8966095 and since 159841681 and 8966095 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (159841601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79920840 + 79920841.

It is an arithmetic number, because the mean of its divisors is an integer number (79920841).

Almost surely, 2^159841681 is an apocalyptic number.

It is an amenable number.

159841681 is a deficient number, since it is larger than the sum of its proper divisors (1).

159841681 is an equidigital number, since it uses as much as digits as its factorization.

159841681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 43.

The square root of 159841681 is about 12642.8509838564. The cubic root of 159841681 is about 542.7044042758.

The spelling of 159841681 in words is "one hundred fifty-nine million, eight hundred forty-one thousand, six hundred eighty-one".