159721371 has 6 divisors (see below), whose sum is σ = 230708660. Its totient is φ = 106480908.

The previous prime is 159721349. The next prime is 159721381. The reversal of 159721371 is 173127951.

159721371 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 159721371 - 2⁵ = 159721339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159721381) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8873401 + ... + 8873418.

Almost surely, 2^159721371 is an apocalyptic number.

159721371 is a deficient number, since it is larger than the sum of its proper divisors (70987289).

159721371 is a wasteful number, since it uses less digits than its factorization.

159721371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17746825 (or 17746822 counting only the distinct ones).

The product of its digits is 13230, while the sum is 36.

The square root of 159721371 is about 12638.0920632823. The cubic root of 159721371 is about 542.5682087710.

The spelling of 159721371 in words is "one hundred fifty-nine million, seven hundred twenty-one thousand, three hundred seventy-one".