218312156 has 6 divisors (see below), whose sum is σ = 382046280. Its totient is φ = 109156076.

The previous prime is 218312123. The next prime is 218312189. The reversal of 218312156 is 651213812.

218312156 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (218312123) and next prime (218312189).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27289016 + ... + 27289023.

It is an arithmetic number, because the mean of its divisors is an integer number (63674380).

Almost surely, 2^218312156 is an apocalyptic number.

It is an amenable number.

218312156 is a deficient number, since it is larger than the sum of its proper divisors (163734124).

218312156 is a wasteful number, since it uses less digits than its factorization.

218312156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54578043 (or 54578041 counting only the distinct ones).

The product of its digits is 2880, while the sum is 29.

The square root of 218312156 is about 14775.3902148133. The cubic root of 218312156 is about 602.1332913095.

Adding to 218312156 its reverse (651213812), we get a palindrome (869525968).

The spelling of 218312156 in words is "two hundred eighteen million, three hundred twelve thousand, one hundred fifty-six".