8521712231 has 2 divisors, whose sum is σ = 8521712232. Its totient is φ = 8521712230.

The previous prime is 8521712197. The next prime is 8521712237. The reversal of 8521712231 is 1322171258.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8521712231 - 2⁶ = 8521712167 is a prime.

It is a super-2 number, since 2×8521712231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8521712237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4260856115 + 4260856116.

It is an arithmetic number, because the mean of its divisors is an integer number (4260856116).

Almost surely, 2^8521712231 is an apocalyptic number.

8521712231 is a deficient number, since it is larger than the sum of its proper divisors (1).

8521712231 is an equidigital number, since it uses as much as digits as its factorization.

8521712231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 32.

The square root of 8521712231 is about 92313.1205788213. The cubic root of 8521712231 is about 2042.5637565936.

Adding to 8521712231 its reverse (1322171258), we get a palindrome (9843883489).

The spelling of 8521712231 in words is "eight billion, five hundred twenty-one million, seven hundred twelve thousand, two hundred thirty-one".