159981815 has 48 divisors (see below), whose sum is σ = 240231744. Its totient is φ = 101606400.

The previous prime is 159981797. The next prime is 159981817. The reversal of 159981815 is 518189951.

It is not a de Polignac number, because 159981815 - 2⁸ = 159981559 is a prime.

It is a super-2 number, since 2×159981815² = 51188362261388450, which contains 22 as substring.

It is a Duffinian number.

Its product of digits (129600) is a multiple of the sum of its prime factors (648).

It is a self number, because there is not a number n which added to its sum of digits gives 159981815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159981817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 295445 + ... + 295985.

It is an arithmetic number, because the mean of its divisors is an integer number (5004828).

Almost surely, 2^159981815 is an apocalyptic number.

159981815 is a deficient number, since it is larger than the sum of its proper divisors (80249929).

159981815 is a wasteful number, since it uses less digits than its factorization.

159981815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648 (or 641 counting only the distinct ones).

The product of its digits is 129600, while the sum is 47.

The square root of 159981815 is about 12648.3917950070. The cubic root of 159981815 is about 542.8629551712.

The spelling of 159981815 in words is "one hundred fifty-nine million, nine hundred eighty-one thousand, eight hundred fifteen".