816539947 has 2 divisors, whose sum is σ = 816539948. Its totient is φ = 816539946.

The previous prime is 816539929. The next prime is 816539957. The reversal of 816539947 is 749935618.

It is a happy number.

816539947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 816539947 - 2¹¹ = 816537899 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 816539894 and 816539903.

It is not a weakly prime, because it can be changed into another prime (816539917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408269973 + 408269974.

It is an arithmetic number, because the mean of its divisors is an integer number (408269974).

Almost surely, 2^816539947 is an apocalyptic number.

816539947 is a deficient number, since it is larger than the sum of its proper divisors (1).

816539947 is an equidigital number, since it uses as much as digits as its factorization.

816539947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 52.

The square root of 816539947 is about 28575.1631141451. The cubic root of 816539947 is about 934.6718121446.

The spelling of 816539947 in words is "eight hundred sixteen million, five hundred thirty-nine thousand, nine hundred forty-seven".