815704243 has 2 divisors, whose sum is σ = 815704244. Its totient is φ = 815704242.

The previous prime is 815704229. The next prime is 815704247. The reversal of 815704243 is 342407518.

815704243 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 815704243 - 2⁹ = 815703731 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 815704199 and 815704208.

It is not a weakly prime, because it can be changed into another prime (815704247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407852121 + 407852122.

It is an arithmetic number, because the mean of its divisors is an integer number (407852122).

Almost surely, 2^815704243 is an apocalyptic number.

815704243 is a deficient number, since it is larger than the sum of its proper divisors (1).

815704243 is an equidigital number, since it uses as much as digits as its factorization.

815704243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 815704243 is about 28560.5364620485. The cubic root of 815704243 is about 934.3528338317.

The spelling of 815704243 in words is "eight hundred fifteen million, seven hundred four thousand, two hundred forty-three".