816354859 has 2 divisors, whose sum is σ = 816354860. Its totient is φ = 816354858.

The previous prime is 816354829. The next prime is 816354881. The reversal of 816354859 is 958453618.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-816354859 is a prime.

It is not a weakly prime, because it can be changed into another prime (816354829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408177429 + 408177430.

It is an arithmetic number, because the mean of its divisors is an integer number (408177430).

Almost surely, 2^816354859 is an apocalyptic number.

816354859 is a deficient number, since it is larger than the sum of its proper divisors (1).

816354859 is an equidigital number, since it uses as much as digits as its factorization.

816354859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1036800, while the sum is 49.

The square root of 816354859 is about 28571.9243139135. The cubic root of 816354859 is about 934.6011850186.

The spelling of 816354859 in words is "eight hundred sixteen million, three hundred fifty-four thousand, eight hundred fifty-nine".