159868999 has 4 divisors (see below), whose sum is σ = 161036064. Its totient is φ = 158701936.

The previous prime is 159868991. The next prime is 159869011. The reversal of 159868999 is 999868951.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999868951 = 79 ⋅12656569.

It is a cyclic number.

It is not a de Polignac number, because 159868999 - 2³ = 159868991 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 159868999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159868991) 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 3 ways as a sum of consecutive naturals, for example, 583327 + ... + 583600.

It is an arithmetic number, because the mean of its divisors is an integer number (40259016).

Almost surely, 2^159868999 is an apocalyptic number.

159868999 is a deficient number, since it is larger than the sum of its proper divisors (1167065).

159868999 is a wasteful number, since it uses less digits than its factorization.

159868999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1167064.

The product of its digits is 12597120, while the sum is 64.

The square root of 159868999 is about 12643.9313111073. The cubic root of 159868999 is about 542.7353197715.

The spelling of 159868999 in words is "one hundred fifty-nine million, eight hundred sixty-eight thousand, nine hundred ninety-nine".