816923539 has 2 divisors, whose sum is σ = 816923540. Its totient is φ = 816923538.

The previous prime is 816923537. The next prime is 816923561. The reversal of 816923539 is 935329618.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 816923539 - 2¹ = 816923537 is a prime.

Together with 816923537, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (816923537) 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, 408461769 + 408461770.

It is an arithmetic number, because the mean of its divisors is an integer number (408461770).

Almost surely, 2^816923539 is an apocalyptic number.

816923539 is a deficient number, since it is larger than the sum of its proper divisors (1).

816923539 is an equidigital number, since it uses as much as digits as its factorization.

816923539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 46.

The square root of 816923539 is about 28581.8743087293. The cubic root of 816923539 is about 934.8181517909.

The spelling of 816923539 in words is "eight hundred sixteen million, nine hundred twenty-three thousand, five hundred thirty-nine".