159979681 has 8 divisors (see below), whose sum is σ = 163618560. Its totient is φ = 156350688.

The previous prime is 159979679. The next prime is 159979711. The reversal of 159979681 is 186979951.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 159979681 - 2¹ = 159979679 is a prime.

It is a super-2 number, since 2×159979681² = 51186996665723522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159979181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37405 + ... + 41461.

It is an arithmetic number, because the mean of its divisors is an integer number (20452320).

Almost surely, 2^159979681 is an apocalyptic number.

It is an amenable number.

159979681 is a deficient number, since it is larger than the sum of its proper divisors (3638879).

159979681 is an equidigital number, since it uses as much as digits as its factorization.

159979681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4943.

The product of its digits is 1224720, while the sum is 55.

The square root of 159979681 is about 12648.3074361750. The cubic root of 159979681 is about 542.8605414080.

The spelling of 159979681 in words is "one hundred fifty-nine million, nine hundred seventy-nine thousand, six hundred eighty-one".