818648819 has 2 divisors, whose sum is σ = 818648820. Its totient is φ = 818648818.

The previous prime is 818648807. The next prime is 818648827. The reversal of 818648819 is 918846818.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 818648819 - 2⁸ = 818648563 is a prime.

It is a super-2 number, since 2×818648819² = 1340371777700189522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (818648849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409324409 + 409324410.

It is an arithmetic number, because the mean of its divisors is an integer number (409324410).

Almost surely, 2^818648819 is an apocalyptic number.

818648819 is a deficient number, since it is larger than the sum of its proper divisors (1).

818648819 is an equidigital number, since it uses as much as digits as its factorization.

818648819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 884736, while the sum is 53.

The square root of 818648819 is about 28612.0397560188. The cubic root of 818648819 is about 935.4757771899.

The spelling of 818648819 in words is "eight hundred eighteen million, six hundred forty-eight thousand, eight hundred nineteen".