218710231 has 2 divisors, whose sum is σ = 218710232. Its totient is φ = 218710230.

The previous prime is 218710213. The next prime is 218710237. The reversal of 218710231 is 132017812.

It is a happy number.

Together with previous prime (218710213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 218710231 - 2⁷ = 218710103 is a prime.

It is a super-2 number, since 2×218710231² = 95668330288146722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 218710196 and 218710205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218710237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109355115 + 109355116.

It is an arithmetic number, because the mean of its divisors is an integer number (109355116).

Almost surely, 2^218710231 is an apocalyptic number.

218710231 is a deficient number, since it is larger than the sum of its proper divisors (1).

218710231 is an equidigital number, since it uses as much as digits as its factorization.

218710231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 218710231 is about 14788.8549590562. The cubic root of 218710231 is about 602.4990499460.

The spelling of 218710231 in words is "two hundred eighteen million, seven hundred ten thousand, two hundred thirty-one".