159961988 has 18 divisors (see below), whose sum is σ = 295444926. Its totient is φ = 75770784.

The previous prime is 159961981. The next prime is 159962017. The reversal of 159961988 is 889169951.

It can be written as a sum of positive squares in only one way, i.e., 104489284 + 55472704 = 10222^2 + 7448^2 .

It is not an unprimeable number, because it can be changed into a prime (159961981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53945 + ... + 56832.

It is an arithmetic number, because the mean of its divisors is an integer number (16413607).

Almost surely, 2^159961988 is an apocalyptic number.

It is an amenable number.

159961988 is a deficient number, since it is larger than the sum of its proper divisors (135482938).

159961988 is a wasteful number, since it uses less digits than its factorization.

159961988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110819 (or 110798 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 56.

The square root of 159961988 is about 12647.6079951902. The cubic root of 159961988 is about 542.8405280629.

The spelling of 159961988 in words is "one hundred fifty-nine million, nine hundred sixty-one thousand, nine hundred eighty-eight".