159891809 has 16 divisors (see below), whose sum is σ = 199656576. Its totient is φ = 124396800.

The previous prime is 159891803. The next prime is 159891811. The reversal of 159891809 is 908198951.

It is not a de Polignac number, because 159891809 - 2²⁰ = 158843233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (159891803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66659 + ... + 69015.

It is an arithmetic number, because the mean of its divisors is an integer number (12478536).

Almost surely, 2^159891809 is an apocalyptic number.

It is an amenable number.

159891809 is a deficient number, since it is larger than the sum of its proper divisors (39764767).

159891809 is a wasteful number, since it uses less digits than its factorization.

159891809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3256.

The product of its (nonzero) digits is 233280, while the sum is 50.

The square root of 159891809 is about 12644.8332926931. The cubic root of 159891809 is about 542.7611309127.

The spelling of 159891809 in words is "one hundred fifty-nine million, eight hundred ninety-one thousand, eight hundred nine".