159509459181 has 4 divisors (see below), whose sum is σ = 212679278912. Its totient is φ = 106339639452.

The previous prime is 159509459177. The next prime is 159509459209. The reversal of 159509459181 is 181954905951.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 159509459181 - 2² = 159509459177 is a prime.

It is a super-2 number, since 2×159509459181² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159509459141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26584909861 + ... + 26584909866.

It is an arithmetic number, because the mean of its divisors is an integer number (53169819728).

Almost surely, 2^159509459181 is an apocalyptic number.

It is an amenable number.

159509459181 is a deficient number, since it is larger than the sum of its proper divisors (53169819731).

159509459181 is an equidigital number, since it uses as much as digits as its factorization.

159509459181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53169819730.

The product of its (nonzero) digits is 2916000, while the sum is 57.

The spelling of 159509459181 in words is "one hundred fifty-nine billion, five hundred nine million, four hundred fifty-nine thousand, one hundred eighty-one".