218834057 has 4 divisors (see below), whose sum is σ = 235667460. Its totient is φ = 202000656.

The previous prime is 218834051. The next prime is 218834171. The reversal of 218834057 is 750438812.

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 120209296 + 98624761 = 10964^2 + 9931^2 .

It is not a de Polignac number, because 218834057 - 2⁸ = 218833801 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 218834057.

It is not an unprimeable number, because it can be changed into a prime (218834051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8416682 + ... + 8416707.

It is an arithmetic number, because the mean of its divisors is an integer number (58916865).

Almost surely, 2^218834057 is an apocalyptic number.

It is an amenable number.

218834057 is a deficient number, since it is larger than the sum of its proper divisors (16833403).

218834057 is a wasteful number, since it uses less digits than its factorization.

218834057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16833402.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 218834057 is about 14793.0408300660. The cubic root of 218834057 is about 602.6127330475.

The spelling of 218834057 in words is "two hundred eighteen million, eight hundred thirty-four thousand, fifty-seven".