43172585609 has 2 divisors, whose sum is σ = 43172585610. Its totient is φ = 43172585608.

The previous prime is 43172585567. The next prime is 43172585623. The reversal of 43172585609 is 90658527134.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42496585609 + 676000000 = 206147^2 + 26000^2 .

It is a cyclic number.

It is not a de Polignac number, because 43172585609 - 2⁸ = 43172585353 is a prime.

It is not a weakly prime, because it can be changed into another prime (43172585699) 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, 21586292804 + 21586292805.

It is an arithmetic number, because the mean of its divisors is an integer number (21586292805).

It is a 1-persistent number, because it is pandigital, but 2⋅43172585609 = 86345171218 is not.

Almost surely, 2^43172585609 is an apocalyptic number.

It is an amenable number.

43172585609 is a deficient number, since it is larger than the sum of its proper divisors (1).

43172585609 is an equidigital number, since it uses as much as digits as its factorization.

43172585609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 43172585609 in words is "forty-three billion, one hundred seventy-two million, five hundred eighty-five thousand, six hundred nine".