818806231 has 2 divisors, whose sum is σ = 818806232. Its totient is φ = 818806230.

The previous prime is 818806229. The next prime is 818806237. The reversal of 818806231 is 132608818.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 818806231 - 2¹ = 818806229 is a prime.

It is a super-2 number, since 2×818806231² = 1340887287848850722, which contains 22 as substring.

Together with 818806229, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (818806237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409403115 + 409403116.

It is an arithmetic number, because the mean of its divisors is an integer number (409403116).

Almost surely, 2^818806231 is an apocalyptic number.

818806231 is a deficient number, since it is larger than the sum of its proper divisors (1).

818806231 is an equidigital number, since it uses as much as digits as its factorization.

818806231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 818806231 is about 28614.7904238350. The cubic root of 818806231 is about 935.5357319480.

The spelling of 818806231 in words is "eight hundred eighteen million, eight hundred six thousand, two hundred thirty-one".