816868231 has 2 divisors, whose sum is σ = 816868232. Its totient is φ = 816868230.

The previous prime is 816868229. The next prime is 816868237. The reversal of 816868231 is 132868618.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 816868231 - 2¹ = 816868229 is a prime.

It is a super-2 number, since 2×816868231² = 1334547413634138722, which contains 22 as substring.

Together with 816868229, 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 (816868237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408434115 + 408434116.

It is an arithmetic number, because the mean of its divisors is an integer number (408434116).

Almost surely, 2^816868231 is an apocalyptic number.

816868231 is a deficient number, since it is larger than the sum of its proper divisors (1).

816868231 is an equidigital number, since it uses as much as digits as its factorization.

816868231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 43.

The square root of 816868231 is about 28580.9067560846. The cubic root of 816868231 is about 934.7970547168.

The spelling of 816868231 in words is "eight hundred sixteen million, eight hundred sixty-eight thousand, two hundred thirty-one".