159857218 has 4 divisors (see below), whose sum is σ = 239785830. Its totient is φ = 79928608.

The previous prime is 159857213. The next prime is 159857231. The reversal of 159857218 is 812758951.

159857218 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 812758951 = 1031 ⋅788321.

It can be written as a sum of positive squares in only one way, i.e., 158080329 + 1776889 = 12573^2 + 1333^2 .

It is not an unprimeable number, because it can be changed into a prime (159857213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39964303 + ... + 39964306.

Almost surely, 2^159857218 is an apocalyptic number.

159857218 is a deficient number, since it is larger than the sum of its proper divisors (79928612).

159857218 is an equidigital number, since it uses as much as digits as its factorization.

159857218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79928611.

The product of its digits is 201600, while the sum is 46.

The square root of 159857218 is about 12643.4654268519. The cubic root of 159857218 is about 542.7219877686.

The spelling of 159857218 in words is "one hundred fifty-nine million, eight hundred fifty-seven thousand, two hundred eighteen".