9999986831 has 2 divisors, whose sum is σ = 9999986832. Its totient is φ = 9999986830.

The previous prime is 9999986813. The next prime is 9999986837. The reversal of 9999986831 is 1386899999.

Together with previous prime (9999986813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9999986831 - 2¹⁴ = 9999970447 is a prime.

It is a super-2 number, since 2×9999986831² (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 (9999986837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999993415 + 4999993416.

It is an arithmetic number, because the mean of its divisors is an integer number (4999993416).

Almost surely, 2^9999986831 is an apocalyptic number.

9999986831 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999986831 is an equidigital number, since it uses as much as digits as its factorization.

9999986831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68024448, while the sum is 71.

The square root of 9999986831 is about 99999.9341549783. The cubic root of 9999986831 is about 2154.4337443065.

The spelling of 9999986831 in words is "nine billion, nine hundred ninety-nine million, nine hundred eighty-six thousand, eight hundred thirty-one".