9985531 has 4 divisors (see below), whose sum is σ = 9991864. Its totient is φ = 9979200.

The previous prime is 9985501. The next prime is 9985553. The reversal of 9985531 is 1355899.

9985531 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1355899 = 53 ⋅25583.

It is a cyclic number.

It is not a de Polignac number, because 9985531 - 2⁵ = 9985499 is a prime.

It is a super-2 number, since 2×9985531² = 199421658703922, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (9985501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1291 + ... + 4651.

It is an arithmetic number, because the mean of its divisors is an integer number (2497966).

Almost surely, 2^9985531 is an apocalyptic number.

9985531 is a deficient number, since it is larger than the sum of its proper divisors (6333).

9985531 is a wasteful number, since it uses less digits than its factorization.

9985531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6332.

The product of its digits is 48600, while the sum is 40.

The square root of 9985531 is about 3159.9890822596. The cubic root of 9985531 is about 215.3395104628.

It can be divided in two parts, 9985 and 531, that multiplied together give a palindrome (5302035).

The spelling of 9985531 in words is "nine million, nine hundred eighty-five thousand, five hundred thirty-one".