9988531 has 4 divisors (see below), whose sum is σ = 11415472. Its totient is φ = 8561592.

The previous prime is 9988519. The next prime is 9988553. The reversal of 9988531 is 1358899.

9988531 is digitally balanced in base 2, 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.

It is a cyclic number.

It is not a de Polignac number, because 9988531 - 2⁷ = 9988403 is a prime.

It is a super-2 number, since 2×9988531² = 199541503075922, 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 (9988331) 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, 713460 + ... + 713473.

It is an arithmetic number, because the mean of its divisors is an integer number (2853868).

Almost surely, 2^9988531 is an apocalyptic number.

9988531 is a deficient number, since it is larger than the sum of its proper divisors (1426941).

9988531 is a wasteful number, since it uses less digits than its factorization.

9988531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426940.

The product of its digits is 77760, while the sum is 43.

The square root of 9988531 is about 3160.4637317963. The cubic root of 9988531 is about 215.3610734571.

The spelling of 9988531 in words is "nine million, nine hundred eighty-eight thousand, five hundred thirty-one".