218248913 has 4 divisors (see below), whose sum is σ = 218296320. Its totient is φ = 218201508.

The previous prime is 218248889. The next prime is 218248931. The reversal of 218248913 is 319842812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 218248913 - 2¹⁶ = 218183377 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (218248963) 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, 15953 + ... + 26286.

It is an arithmetic number, because the mean of its divisors is an integer number (54574080).

Almost surely, 2^218248913 is an apocalyptic number.

It is an amenable number.

218248913 is a deficient number, since it is larger than the sum of its proper divisors (47407).

218248913 is an equidigital number, since it uses as much as digits as its factorization.

218248913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47406.

The product of its digits is 27648, while the sum is 38.

The square root of 218248913 is about 14773.2499132723. The cubic root of 218248913 is about 602.0751415570.

The spelling of 218248913 in words is "two hundred eighteen million, two hundred forty-eight thousand, nine hundred thirteen".