218696997 has 8 divisors (see below), whose sum is σ = 292108960. Its totient is φ = 145541520.

The previous prime is 218696981. The next prime is 218697007. The reversal of 218696997 is 799696812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 218696997 - 2⁴ = 218696981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218696927) 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 in 7 ways as a sum of consecutive naturals, for example, 62122 + ... + 65547.

It is an arithmetic number, because the mean of its divisors is an integer number (36513620).

Almost surely, 2^218696997 is an apocalyptic number.

It is an amenable number.

218696997 is a deficient number, since it is larger than the sum of its proper divisors (73411963).

218696997 is a wasteful number, since it uses less digits than its factorization.

218696997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128243.

The product of its digits is 2939328, while the sum is 57.

The square root of 218696997 is about 14788.4075207576. The cubic root of 218696997 is about 602.4868974384.

The spelling of 218696997 in words is "two hundred eighteen million, six hundred ninety-six thousand, nine hundred ninety-seven".