218380801 has 4 divisors (see below), whose sum is σ = 223707204. Its totient is φ = 213054400.

The previous prime is 218380783. The next prime is 218380819. The reversal of 218380801 is 108083812.

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

It is an interprime number because it is at equal distance from previous prime (218380783) and next prime (218380819).

It can be written as a sum of positive squares in 2 ways, for example, as 9144576 + 209236225 = 3024^2 + 14465^2 .

It is a cyclic number.

It is not a de Polignac number, because 218380801 - 2⁵ = 218380769 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218383801) 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, 2663140 + ... + 2663221.

It is an arithmetic number, because the mean of its divisors is an integer number (55926801).

Almost surely, 2^218380801 is an apocalyptic number.

It is an amenable number.

218380801 is a deficient number, since it is larger than the sum of its proper divisors (5326403).

218380801 is an equidigital number, since it uses as much as digits as its factorization.

218380801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5326402.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 218380801 is about 14777.7129827318. The cubic root of 218380801 is about 602.1963953056.

The spelling of 218380801 in words is "two hundred eighteen million, three hundred eighty thousand, eight hundred one".