809243975 has 6 divisors (see below), whose sum is σ = 1003462560. Its totient is φ = 647395160.

The previous prime is 809243969. The next prime is 809243977. The reversal of 809243975 is 579342908.

It is a happy number.

It is not a de Polignac number, because 809243975 - 2⁴ = 809243959 is a prime.

It is a super-2 number, since 2×809243975² = 1309751622147601250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809243977) 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 in 5 ways as a sum of consecutive naturals, for example, 16184855 + ... + 16184904.

It is an arithmetic number, because the mean of its divisors is an integer number (167243760).

Almost surely, 2^809243975 is an apocalyptic number.

809243975 is a deficient number, since it is larger than the sum of its proper divisors (194218585).

809243975 is a wasteful number, since it uses less digits than its factorization.

809243975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32369769 (or 32369764 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 47.

The square root of 809243975 is about 28447.2138354532. The cubic root of 809243975 is about 931.8796435511.

The spelling of 809243975 in words is "eight hundred nine million, two hundred forty-three thousand, nine hundred seventy-five".