159721520 has 80 divisors (see below), whose sum is σ = 426639360. Its totient is φ = 54473472.

The previous prime is 159721481. The next prime is 159721537. The reversal of 159721520 is 25127951.

It is a happy number.

159721520 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×159721520² = 51021927902220800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124241 + ... + 125519.

It is an arithmetic number, because the mean of its divisors is an integer number (5332992).

Almost surely, 2^159721520 is an apocalyptic number.

159721520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 159721520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (213319680).

159721520 is an abundant number, since it is smaller than the sum of its proper divisors (266917840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

159721520 is a wasteful number, since it uses less digits than its factorization.

With its successor (159721521) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (1516).

159721520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1522 (or 1516 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 32.

The square root of 159721520 is about 12638.0979581581. The cubic root of 159721520 is about 542.5683774870.

The spelling of 159721520 in words is "one hundred fifty-nine million, seven hundred twenty-one thousand, five hundred twenty".