218741 has 4 divisors (see below), whose sum is σ = 223872. Its totient is φ = 213612.

The previous prime is 218737. The next prime is 218749. The reversal of 218741 is 147812.

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 218741 - 2² = 218737 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218749) 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, 2501 + ... + 2586.

It is an arithmetic number, because the mean of its divisors is an integer number (55968).

2²¹⁸⁷⁴¹ is an apocalyptic number.

It is an amenable number.

218741 is a deficient number, since it is larger than the sum of its proper divisors (5131).

218741 is an equidigital number, since it uses as much as digits as its factorization.

218741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5130.

The product of its digits is 448, while the sum is 23.

The square root of 218741 is about 467.6975518431. The cubic root of 218741 is about 60.2527302586.

It can be divided in two parts, 218 and 741, that added together give a palindrome (959).

The spelling of 218741 in words is "two hundred eighteen thousand, seven hundred forty-one".