218719093 has 4 divisors (see below), whose sum is σ = 231584940. Its totient is φ = 205853248.

The previous prime is 218719091. The next prime is 218719103. The reversal of 218719093 is 390917812.

218719093 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.

It can be written as a sum of positive squares in 2 ways, for example, as 109035364 + 109683729 = 10442^2 + 10473^2 .

It is a cyclic number.

It is not a de Polignac number, because 218719093 - 2¹ = 218719091 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 (218719091) 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, 6432898 + ... + 6432931.

It is an arithmetic number, because the mean of its divisors is an integer number (57896235).

Almost surely, 2^218719093 is an apocalyptic number.

It is an amenable number.

218719093 is a deficient number, since it is larger than the sum of its proper divisors (12865847).

218719093 is a wasteful number, since it uses less digits than its factorization.

218719093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12865846.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 218719093 is about 14789.1545735380. The cubic root of 218719093 is about 602.5071874627.

The spelling of 218719093 in words is "two hundred eighteen million, seven hundred nineteen thousand, ninety-three".