9916621 has 16 divisors (see below), whose sum is σ = 12031488. Its totient is φ = 8049600.

The previous prime is 9916619. The next prime is 9916631. The reversal of 9916621 is 1266199.

9916621 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9916621 - 2¹ = 9916619 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 (9916631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3315 + ... + 5551.

It is an arithmetic number, because the mean of its divisors is an integer number (751968).

Almost surely, 2^9916621 is an apocalyptic number.

It is an amenable number.

9916621 is a deficient number, since it is larger than the sum of its proper divisors (2114867).

9916621 is a wasteful number, since it uses less digits than its factorization.

9916621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2292.

The product of its digits is 5832, while the sum is 34.

The square root of 9916621 is about 3149.0666871313. The cubic root of 9916621 is about 214.8430150229.

The spelling of 9916621 in words is "nine million, nine hundred sixteen thousand, six hundred twenty-one".