816919 has 2 divisors, whose sum is σ = 816920. Its totient is φ = 816918.

The previous prime is 816917. The next prime is 816929. The reversal of 816919 is 919618.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 816919 - 2¹ = 816917 is a prime.

It is a super-2 number, since 2×816919² = 1334713305122, which contains 22 as substring.

Together with 816917, it forms a pair of twin primes.

It is a plaindrome in base 13.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (816911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408459 + 408460.

It is an arithmetic number, because the mean of its divisors is an integer number (408460).

2⁸¹⁶⁹¹⁹ is an apocalyptic number.

816919 is a deficient number, since it is larger than the sum of its proper divisors (1).

816919 is an equidigital number, since it uses as much as digits as its factorization.

816919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 34.

The square root of 816919 is about 903.8357151607. The cubic root of 816919 is about 93.4816420439.

The spelling of 816919 in words is "eight hundred sixteen thousand, nine hundred nineteen".