816291479 has 2 divisors, whose sum is σ = 816291480. Its totient is φ = 816291478.

The previous prime is 816291467. The next prime is 816291481. The reversal of 816291479 is 974192618.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-816291479 is a prime.

Together with 816291481, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (816291409) 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, 408145739 + 408145740.

It is an arithmetic number, because the mean of its divisors is an integer number (408145740).

Almost surely, 2^816291479 is an apocalyptic number.

816291479 is a deficient number, since it is larger than the sum of its proper divisors (1).

816291479 is an equidigital number, since it uses as much as digits as its factorization.

816291479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 47.

The square root of 816291479 is about 28570.8151616295. The cubic root of 816291479 is about 934.5769975975.

The spelling of 816291479 in words is "eight hundred sixteen million, two hundred ninety-one thousand, four hundred seventy-nine".