218880001 has 2 divisors, whose sum is σ = 218880002. Its totient is φ = 218880000.

The previous prime is 218879989. The next prime is 218880043. The reversal of 218880001 is 100088812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170563600 + 48316401 = 13060^2 + 6951^2 .

It is a cyclic number.

It is not a de Polignac number, because 218880001 - 2⁹ = 218879489 is a prime.

It is not a weakly prime, because it can be changed into another prime (218880091) 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 as a sum of consecutive naturals, namely, 109440000 + 109440001.

It is an arithmetic number, because the mean of its divisors is an integer number (109440001).

Almost surely, 2^218880001 is an apocalyptic number.

It is an amenable number.

218880001 is a deficient number, since it is larger than the sum of its proper divisors (1).

218880001 is an equidigital number, since it uses as much as digits as its factorization.

218880001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1024, while the sum is 28.

The square root of 218880001 is about 14794.5936409217. The cubic root of 218880001 is about 602.6549027513.

The spelling of 218880001 in words is "two hundred eighteen million, eight hundred eighty thousand, one".