819494279 has 2 divisors, whose sum is σ = 819494280. Its totient is φ = 819494278.

The previous prime is 819494261. The next prime is 819494281. The reversal of 819494279 is 972494918.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 819494279 - 2⁸ = 819494023 is a prime.

Together with 819494281, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 819494279.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (819494479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409747139 + 409747140.

It is an arithmetic number, because the mean of its divisors is an integer number (409747140).

Almost surely, 2^819494279 is an apocalyptic number.

819494279 is a deficient number, since it is larger than the sum of its proper divisors (1).

819494279 is an equidigital number, since it uses as much as digits as its factorization.

819494279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 53.

The square root of 819494279 is about 28626.8104929627. The cubic root of 819494279 is about 935.7977040928.

The spelling of 819494279 in words is "eight hundred nineteen million, four hundred ninety-four thousand, two hundred seventy-nine".