9985231 has 2 divisors, whose sum is σ = 9985232.
Its totient is φ = 9985230.
The previous prime is 9985229. The next prime is 9985247. The reversal of 9985231 is 1325899.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 9985231 - 21 = 9985229 is a prime.
It is a super-2 number, since 2×99852312 = 199409676246722, which contains 22 as substring.
Together with 9985229, it forms a pair of twin primes.
It is a Chen prime.
9985231 is a lucky number.
It is equal to p663688 and since 9985231 and 663688 have the same sum of digits, it is a Honaker prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (9985631) 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, 4992615 + 4992616.
It is an arithmetic number, because the mean of its divisors is an integer number (4992616).
Almost surely, 29985231 is an apocalyptic number.
9985231 is a deficient number, since it is larger than the sum of its proper divisors (1).
9985231 is an equidigital number, since it uses as much as digits as its factorization.
9985231 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 19440, while the sum is 37.
The square root of 9985231 is about 3159.9416133847.
The cubic root of 9985231 is about 215.3373539258.
The spelling of 9985231 in words is "nine million, nine hundred eighty-five thousand, two hundred thirty-one".