218464157 has 4 divisors (see below), whose sum is σ = 218883996. Its totient is φ = 218044320.

The previous prime is 218464139. The next prime is 218464159. The reversal of 218464157 is 751464812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 86007076 + 132457081 = 9274^2 + 11509^2 .

It is a cyclic number.

It is not a de Polignac number, because 218464157 - 2¹² = 218460061 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 218464157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218464159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209138 + ... + 210179.

It is an arithmetic number, because the mean of its divisors is an integer number (54720999).

Almost surely, 2^218464157 is an apocalyptic number.

It is an amenable number.

218464157 is a deficient number, since it is larger than the sum of its proper divisors (419839).

218464157 is an equidigital number, since it uses as much as digits as its factorization.

218464157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419838.

The product of its digits is 53760, while the sum is 38.

The square root of 218464157 is about 14780.5330418087. The cubic root of 218464157 is about 602.2730050582.

The spelling of 218464157 in words is "two hundred eighteen million, four hundred sixty-four thousand, one hundred fifty-seven".