9871217311 has 2 divisors, whose sum is σ = 9871217312. Its totient is φ = 9871217310.

The previous prime is 9871217281. The next prime is 9871217327. The reversal of 9871217311 is 1137121789.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9871217311 - 2⁹ = 9871216799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9871217381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4935608655 + 4935608656.

It is an arithmetic number, because the mean of its divisors is an integer number (4935608656).

Almost surely, 2^9871217311 is an apocalyptic number.

9871217311 is a deficient number, since it is larger than the sum of its proper divisors (1).

9871217311 is an equidigital number, since it uses as much as digits as its factorization.

9871217311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 40.

The square root of 9871217311 is about 99353.9999748374. Note that the first 4 decimals coincide. The cubic root of 9871217311 is about 2145.1462390358.

The spelling of 9871217311 in words is "nine billion, eight hundred seventy-one million, two hundred seventeen thousand, three hundred eleven".