159973681 has 12 divisors (see below), whose sum is σ = 191123508. Its totient is φ = 133412832.

The previous prime is 159973669. The next prime is 159973687. The reversal of 159973681 is 186379951.

It can be written as a sum of positive squares in 2 ways, for example, as 108493056 + 51480625 = 10416^2 + 7175^2 .

It is not a de Polignac number, because 159973681 - 2¹⁹ = 159449393 is a prime.

It is a super-2 number, since 2×159973681² = 51183157225379522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159973687) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42306 + ... + 45931.

It is an arithmetic number, because the mean of its divisors is an integer number (15926959).

Almost surely, 2^159973681 is an apocalyptic number.

It is an amenable number.

159973681 is a deficient number, since it is larger than the sum of its proper divisors (31149827).

159973681 is an equidigital number, since it uses as much as digits as its factorization.

159973681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88288 (or 88281 counting only the distinct ones).

The product of its digits is 408240, while the sum is 49.

The square root of 159973681 is about 12648.0702480655. The cubic root of 159973681 is about 542.8537547045.

The spelling of 159973681 in words is "one hundred fifty-nine million, nine hundred seventy-three thousand, six hundred eighty-one".