218111157 has 16 divisors (see below), whose sum is σ = 352503360. Its totient is φ = 132188400.

The previous prime is 218111149. The next prime is 218111167. The reversal of 218111157 is 751111812.

It is not a de Polignac number, because 218111157 - 2³ = 218111149 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 218111157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218111107) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 366894 + ... + 367487.

It is an arithmetic number, because the mean of its divisors is an integer number (22031460).

Almost surely, 2^218111157 is an apocalyptic number.

218111157 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

218111157 is a deficient number, since it is larger than the sum of its proper divisors (134392203).

218111157 is a wasteful number, since it uses less digits than its factorization.

218111157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734401 (or 734395 counting only the distinct ones).

The product of its digits is 560, while the sum is 27.

The square root of 218111157 is about 14768.5868315151. The cubic root of 218111157 is about 601.9484407817.

Adding to 218111157 its reverse (751111812), we get a palindrome (969222969).

The spelling of 218111157 in words is "two hundred eighteen million, one hundred eleven thousand, one hundred fifty-seven".