159721100 has 72 divisors (see below), whose sum is σ = 432139008. Its totient is φ = 49780800.

The previous prime is 159721061. The next prime is 159721127. The reversal of 159721100 is 1127951.

It is a self number, because there is not a number n which added to its sum of digits gives 159721100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2672 + ... + 18071.

Almost surely, 2^159721100 is an apocalyptic number.

159721100 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 159721100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216069504).

159721100 is an abundant number, since it is smaller than the sum of its proper divisors (272417908).

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

159721100 is a wasteful number, since it uses less digits than its factorization.

159721100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20775 (or 20768 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 26.

The square root of 159721100 is about 12638.0813417227. The cubic root of 159721100 is about 542.5679019115.

The spelling of 159721100 in words is "one hundred fifty-nine million, seven hundred twenty-one thousand, one hundred".