218117801 has 16 divisors (see below), whose sum is σ = 245465088. Its totient is φ = 192099600.

The previous prime is 218117791. The next prime is 218117821. The reversal of 218117801 is 108711812.

It is not a de Polignac number, because 218117801 - 2¹⁸ = 217855657 is a prime.

It is a super-2 number, since 2×218117801² = 95150750226151202, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (218117821) 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 15 ways as a sum of consecutive naturals, for example, 58256 + ... + 61886.

It is an arithmetic number, because the mean of its divisors is an integer number (15341568).

Almost surely, 2^218117801 is an apocalyptic number.

It is an amenable number.

218117801 is a deficient number, since it is larger than the sum of its proper divisors (27347287).

218117801 is a wasteful number, since it uses less digits than its factorization.

218117801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3812.

The product of its (nonzero) digits is 896, while the sum is 29.

The square root of 218117801 is about 14768.8117666927. The cubic root of 218117801 is about 601.9545528102.

The spelling of 218117801 in words is "two hundred eighteen million, one hundred seventeen thousand, eight hundred one".