218872869 has 4 divisors (see below), whose sum is σ = 291830496. Its totient is φ = 145915244.

The previous prime is 218872859. The next prime is 218872873. The reversal of 218872869 is 968278812.

It is a happy number.

218872869 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, 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 218872869 - 2⁸ = 218872613 is a prime.

It is a super-2 number, since 2×218872869² = 95810665568582322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218872859) 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, 36478809 + ... + 36478814.

It is an arithmetic number, because the mean of its divisors is an integer number (72957624).

Almost surely, 2^218872869 is an apocalyptic number.

It is an amenable number.

218872869 is a deficient number, since it is larger than the sum of its proper divisors (72957627).

218872869 is an equidigital number, since it uses as much as digits as its factorization.

218872869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72957626.

The product of its digits is 774144, while the sum is 51.

The square root of 218872869 is about 14794.3526049638. The cubic root of 218872869 is about 602.6483570315.

It can be divided in two parts, 2188 and 72869, that added together give a palindrome (75057).

The spelling of 218872869 in words is "two hundred eighteen million, eight hundred seventy-two thousand, eight hundred sixty-nine".