218801 has 4 divisors (see below), whose sum is σ = 238704. Its totient is φ = 198900.

The previous prime is 218797. The next prime is 218809. The reversal of 218801 is 108812.

218801 = 136² + 137² + ... + 146².

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 218801 - 2² = 218797 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 218801.

It is not an unprimeable number, because it can be changed into a prime (218809) 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, 9935 + ... + 9956.

It is an arithmetic number, because the mean of its divisors is an integer number (59676).

2²¹⁸⁸⁰¹ is an apocalyptic number.

It is an amenable number.

218801 is a deficient number, since it is larger than the sum of its proper divisors (19903).

218801 is a wasteful number, since it uses less digits than its factorization.

218801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19902.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 218801 is about 467.7616914627. The cubic root of 218801 is about 60.2582388026.

The spelling of 218801 in words is "two hundred eighteen thousand, eight hundred one".