159059981 has 2 divisors, whose sum is σ = 159059982. Its totient is φ = 159059980.

The previous prime is 159059959. The next prime is 159060023. The reversal of 159059981 is 189950951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157904356 + 1155625 = 12566^2 + 1075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-159059981 is a prime.

It is a super-2 number, since 2×159059981² = 50600155111440722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (159059911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79529990 + 79529991.

It is an arithmetic number, because the mean of its divisors is an integer number (79529991).

Almost surely, 2^159059981 is an apocalyptic number.

It is an amenable number.

159059981 is a deficient number, since it is larger than the sum of its proper divisors (1).

159059981 is an equidigital number, since it uses as much as digits as its factorization.

159059981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145800, while the sum is 47.

The square root of 159059981 is about 12611.8983900125. The cubic root of 159059981 is about 541.8182660273.

The spelling of 159059981 in words is "one hundred fifty-nine million, fifty-nine thousand, nine hundred eighty-one".