9907621 has 2 divisors, whose sum is σ = 9907622. Its totient is φ = 9907620.

The previous prime is 9907619. The next prime is 9907637. The reversal of 9907621 is 1267099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6558721 + 3348900 = 2561^2 + 1830^2 .

It is a cyclic number.

It is not a de Polignac number, because 9907621 - 2¹ = 9907619 is a prime.

Together with 9907619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9907021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4953810 + 4953811.

It is an arithmetic number, because the mean of its divisors is an integer number (4953811).

Almost surely, 2^9907621 is an apocalyptic number.

It is an amenable number.

9907621 is a deficient number, since it is larger than the sum of its proper divisors (1).

9907621 is an equidigital number, since it uses as much as digits as its factorization.

9907621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 9907621 is about 3147.6373679317. The cubic root of 9907621 is about 214.7780005258.

The spelling of 9907621 in words is "nine million, nine hundred seven thousand, six hundred twenty-one".