159681000 has 256 divisors, whose sum is σ = 549918720. Its totient is φ = 38400000.

The previous prime is 159680987. The next prime is 159681029. The reversal of 159681000 is 186951.

It is a happy number.

It is a super-2 number, since 2×159681000² = 50996043522000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

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 63 ways as a sum of consecutive naturals, for example, 1580950 + ... + 1581050.

It is an arithmetic number, because the mean of its divisors is an integer number (2148120).

Almost surely, 2^159681000 is an apocalyptic number.

159681000 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 159681000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274959360).

159681000 is an abundant number, since it is smaller than the sum of its proper divisors (390237720).

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

159681000 is a wasteful number, since it uses less digits than its factorization.

159681000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173 (or 159 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 159681000 is about 12636.4947671417. The cubic root of 159681000 is about 542.5224919356.

The spelling of 159681000 in words is "one hundred fifty-nine million, six hundred eighty-one thousand".