9909631621 has 8 divisors (see below), whose sum is σ = 10459164320. Its totient is φ = 9362896272.

The previous prime is 9909631591. The next prime is 9909631631. The reversal of 9909631621 is 1261369099.

9909631621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9909631621 - 2⁷ = 9909631493 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 (9909631631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 692055 + ... + 706228.

It is an arithmetic number, because the mean of its divisors is an integer number (1307395540).

Almost surely, 2^9909631621 is an apocalyptic number.

It is an amenable number.

9909631621 is a deficient number, since it is larger than the sum of its proper divisors (549532699).

9909631621 is a wasteful number, since it uses less digits than its factorization.

9909631621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1398675.

The product of its (nonzero) digits is 157464, while the sum is 46.

The square root of 9909631621 is about 99547.1326608657. The cubic root of 9909631621 is about 2147.9252833050.

The spelling of 9909631621 in words is "nine billion, nine hundred nine million, six hundred thirty-one thousand, six hundred twenty-one".