9993231287 has 4 divisors (see below), whose sum is σ = 10761941400. Its totient is φ = 9224521176.

The previous prime is 9993231263. The next prime is 9993231293. The reversal of 9993231287 is 7821323999.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 9993231287 - 2⁶ = 9993231223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9993231217) 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 in 3 ways as a sum of consecutive naturals, for example, 384355037 + ... + 384355062.

It is an arithmetic number, because the mean of its divisors is an integer number (2690485350).

Almost surely, 2^9993231287 is an apocalyptic number.

9993231287 is a deficient number, since it is larger than the sum of its proper divisors (768710113).

9993231287 is a wasteful number, since it uses less digits than its factorization.

9993231287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768710112.

The product of its digits is 1469664, while the sum is 53.

The square root of 9993231287 is about 99966.1507061265. The cubic root of 9993231287 is about 2153.9484886470.

The spelling of 9993231287 in words is "nine billion, nine hundred ninety-three million, two hundred thirty-one thousand, two hundred eighty-seven".