218081001 has 16 divisors (see below), whose sum is σ = 303964160. Its totient is φ = 138911760.

The previous prime is 218080991. The next prime is 218081023. The reversal of 218081001 is 100180812.

It is not a de Polignac number, because 218081001 - 2⁶ = 218080937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218081041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7495 + ... + 22188.

It is an arithmetic number, because the mean of its divisors is an integer number (18997760).

Almost surely, 2^218081001 is an apocalyptic number.

It is an amenable number.

218081001 is a deficient number, since it is larger than the sum of its proper divisors (85883159).

218081001 is a wasteful number, since it uses less digits than its factorization.

218081001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29796.

The product of its (nonzero) digits is 128, while the sum is 21.

The square root of 218081001 is about 14767.5658454601. The cubic root of 218081001 is about 601.9206977506.

The spelling of 218081001 in words is "two hundred eighteen million, eighty-one thousand, one".