218676491 has 16 divisors (see below), whose sum is σ = 265887360. Its totient is φ = 177252480.

The previous prime is 218676487. The next prime is 218676517. The reversal of 218676491 is 194676812.

It is a cyclic number.

It is not a de Polignac number, because 218676491 - 2² = 218676487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218676421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27221 + ... + 34326.

It is an arithmetic number, because the mean of its divisors is an integer number (16617960).

Almost surely, 2^218676491 is an apocalyptic number.

218676491 is a deficient number, since it is larger than the sum of its proper divisors (47210869).

218676491 is a wasteful number, since it uses less digits than its factorization.

218676491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61594.

The product of its digits is 145152, while the sum is 44.

The square root of 218676491 is about 14787.7141911791. The cubic root of 218676491 is about 602.4680662356.

The spelling of 218676491 in words is "two hundred eighteen million, six hundred seventy-six thousand, four hundred ninety-one".