159289981 has 4 divisors (see below), whose sum is σ = 159668764. Its totient is φ = 158911200.

The previous prime is 159289979. The next prime is 159289987. The reversal of 159289981 is 189982951.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45441081 + 113848900 = 6741^2 + 10670^2 .

It is a cyclic number.

It is not a de Polignac number, because 159289981 - 2¹ = 159289979 is a prime.

It is a super-2 number, since 2×159289981² = 50746596093960722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159289987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188760 + ... + 189601.

It is an arithmetic number, because the mean of its divisors is an integer number (39917191).

Almost surely, 2^159289981 is an apocalyptic number.

It is an amenable number.

159289981 is a deficient number, since it is larger than the sum of its proper divisors (378783).

159289981 is an equidigital number, since it uses as much as digits as its factorization.

159289981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378782.

The product of its digits is 466560, while the sum is 52.

The square root of 159289981 is about 12621.0134696069. The cubic root of 159289981 is about 542.0792958242.

The spelling of 159289981 in words is "one hundred fifty-nine million, two hundred eighty-nine thousand, nine hundred eighty-one".