218798131 has 4 divisors (see below), whose sum is σ = 224711632. Its totient is φ = 212884632.

The previous prime is 218798123. The next prime is 218798159. The reversal of 218798131 is 131897812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 218798131 - 2³ = 218798123 is a prime.

It is a super-2 number, since 2×218798131² = 95745244258186322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218798101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2956695 + ... + 2956768.

It is an arithmetic number, because the mean of its divisors is an integer number (56177908).

Almost surely, 2^218798131 is an apocalyptic number.

218798131 is a deficient number, since it is larger than the sum of its proper divisors (5913501).

218798131 is an equidigital number, since it uses as much as digits as its factorization.

218798131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5913500.

The product of its digits is 24192, while the sum is 40.

The square root of 218798131 is about 14791.8264930332. The cubic root of 218798131 is about 602.5797542535.

The spelling of 218798131 in words is "two hundred eighteen million, seven hundred ninety-eight thousand, one hundred thirty-one".