9999631 has 4 divisors (see below), whose sum is σ = 10023264. Its totient is φ = 9976000.

The previous prime is 9999601. The next prime is 9999637. The reversal of 9999631 is 1369999.

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 9999631 - 2¹¹ = 9997583 is a prime.

It is a super-2 number, since 2×9999631² = 199985240272322, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11170 + ... + 12031.

It is an arithmetic number, because the mean of its divisors is an integer number (2505816).

Almost surely, 2^9999631 is an apocalyptic number.

9999631 is a deficient number, since it is larger than the sum of its proper divisors (23633).

9999631 is a wasteful number, since it uses less digits than its factorization.

9999631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23632.

The product of its digits is 118098, while the sum is 46.

The square root of 9999631 is about 3162.2193156073. The cubic root of 9999631 is about 215.4408190159.

The spelling of 9999631 in words is "nine million, nine hundred ninety-nine thousand, six hundred thirty-one".