159609381 has 8 divisors (see below), whose sum is σ = 212873184. Its totient is φ = 106375920.

The previous prime is 159609377. The next prime is 159609403. The reversal of 159609381 is 183906951.

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

It is not a de Polignac number, because 159609381 - 2² = 159609377 is a prime.

It is a super-3 number, since 3×159609381³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159609181) 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, 11691 + ... + 21351.

It is an arithmetic number, because the mean of its divisors is an integer number (26609148).

Almost surely, 2^159609381 is an apocalyptic number.

It is an amenable number.

159609381 is a deficient number, since it is larger than the sum of its proper divisors (53263803).

159609381 is an equidigital number, since it uses as much as digits as its factorization.

159609381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15171.

The product of its (nonzero) digits is 58320, while the sum is 42.

The square root of 159609381 is about 12633.6606334031. The cubic root of 159609381 is about 542.4413703478.

The spelling of 159609381 in words is "one hundred fifty-nine million, six hundred nine thousand, three hundred eighty-one".