218410819 has 4 divisors (see below), whose sum is σ = 238266360. Its totient is φ = 198555280.

The previous prime is 218410793. The next prime is 218410823. The reversal of 218410819 is 918014812.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 218410819 - 2¹³ = 218402627 is a prime.

It is a super-2 number, since 2×218410819² = 95406571712501522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218410859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9927754 + ... + 9927775.

It is an arithmetic number, because the mean of its divisors is an integer number (59566590).

Almost surely, 2^218410819 is an apocalyptic number.

218410819 is a deficient number, since it is larger than the sum of its proper divisors (19855541).

218410819 is a wasteful number, since it uses less digits than its factorization.

218410819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19855540.

The product of its (nonzero) digits is 4608, while the sum is 34.

The square root of 218410819 is about 14778.7285989019. The cubic root of 218410819 is about 602.2239861059.

The spelling of 218410819 in words is "two hundred eighteen million, four hundred ten thousand, eight hundred nineteen".