218157 has 4 divisors (see below), whose sum is σ = 290880. Its totient is φ = 145436.

The previous prime is 218149. The next prime is 218171. The reversal of 218157 is 751812.

218157 is digitally balanced in base 2, 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 218157 - 2³ = 218149 is a prime.

It is an Ulam number.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218107) 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, 36357 + ... + 36362.

It is an arithmetic number, because the mean of its divisors is an integer number (72720).

2²¹⁸¹⁵⁷ is an apocalyptic number.

It is an amenable number.

218157 is a deficient number, since it is larger than the sum of its proper divisors (72723).

218157 is an equidigital number, since it uses as much as digits as its factorization.

218157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72722.

The product of its digits is 560, while the sum is 24.

The square root of 218157 is about 467.0727994649. The cubic root of 218157 is about 60.1990610700.

Adding to 218157 its reverse (751812), we get a palindrome (969969).

The spelling of 218157 in words is "two hundred eighteen thousand, one hundred fifty-seven".