8538172843 has 2 divisors, whose sum is σ = 8538172844. Its totient is φ = 8538172842.

The previous prime is 8538172817. The next prime is 8538172847. The reversal of 8538172843 is 3482718358.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8538172843 - 2¹³ = 8538164651 is a prime.

It is not a weakly prime, because it can be changed into another prime (8538172847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4269086421 + 4269086422.

It is an arithmetic number, because the mean of its divisors is an integer number (4269086422).

Almost surely, 2^8538172843 is an apocalyptic number.

8538172843 is a deficient number, since it is larger than the sum of its proper divisors (1).

8538172843 is an equidigital number, since it uses as much as digits as its factorization.

8538172843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1290240, while the sum is 49.

The square root of 8538172843 is about 92402.2339719122. The cubic root of 8538172843 is about 2043.8780552419.

The spelling of 8538172843 in words is "eight billion, five hundred thirty-eight million, one hundred seventy-two thousand, eight hundred forty-three".