159688989 has 10 divisors (see below), whose sum is σ = 238547870. Its totient is φ = 106459272.

The previous prime is 159688957. The next prime is 159688999. The reversal of 159688989 is 989886951.

It can be written as a sum of positive squares in only one way, i.e., 114126489 + 45562500 = 10683^2 + 6750^2 .

It is not a de Polignac number, because 159688989 - 2⁵ = 159688957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159688909) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 985654 + ... + 985815.

It is an arithmetic number, because the mean of its divisors is an integer number (23854787).

Almost surely, 2^159688989 is an apocalyptic number.

It is an amenable number.

159688989 is a deficient number, since it is larger than the sum of its proper divisors (78858881).

159688989 is an equidigital number, since it uses as much as digits as its factorization.

159688989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1971481 (or 1971472 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 63.

The square root of 159688989 is about 12636.8108714185. The cubic root of 159688989 is about 542.5315394322.

The spelling of 159688989 in words is "one hundred fifty-nine million, six hundred eighty-eight thousand, nine hundred eighty-nine".