159218 has 4 divisors (see below), whose sum is σ = 238830. Its totient is φ = 79608.

The previous prime is 159209. The next prime is 159223. The reversal of 159218 is 812951.

It is a happy number.

159218 is an esthetic number in base 7, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 812951 = 421 ⋅1931.

It can be written as a sum of positive squares in only one way, i.e., 120409 + 38809 = 347^2 + 197^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39803 + ... + 39806.

2¹⁵⁹²¹⁸ is an apocalyptic number.

159218 is a deficient number, since it is larger than the sum of its proper divisors (79612).

159218 is an equidigital number, since it uses as much as digits as its factorization.

159218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79611.

The product of its digits is 720, while the sum is 26.

The square root of 159218 is about 399.0213026895. The cubic root of 159218 is about 54.1997630741.

The spelling of 159218 in words is "one hundred fifty-nine thousand, two hundred eighteen".