218323813 has 8 divisors (see below), whose sum is σ = 230713920. Its totient is φ = 206023680.

The previous prime is 218323799. The next prime is 218323823. The reversal of 218323813 is 318323812.

218323813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 218323813 - 2¹³ = 218315621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218323823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17473 + ... + 27238.

It is an arithmetic number, because the mean of its divisors is an integer number (28839240).

Almost surely, 2^218323813 is an apocalyptic number.

It is an amenable number.

218323813 is a deficient number, since it is larger than the sum of its proper divisors (12390107).

218323813 is a wasteful number, since it uses less digits than its factorization.

218323813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44987.

The product of its digits is 6912, while the sum is 31.

The square root of 218323813 is about 14775.7846830549. The cubic root of 218323813 is about 602.1440082923.

Subtracting 218323813 from its reverse (318323812), we obtain a palindrome (99999999).

The spelling of 218323813 in words is "two hundred eighteen million, three hundred twenty-three thousand, eight hundred thirteen".