9900549 has 20 divisors (see below), whose sum is σ = 14880096. Its totient is φ = 6587244.

The previous prime is 9900547. The next prime is 9900589. The reversal of 9900549 is 9450099.

It is not a de Polignac number, because 9900549 - 2¹ = 9900547 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9900547) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 19432 + ... + 19934.

Almost surely, 2^9900549 is an apocalyptic number.

It is an amenable number.

9900549 is a deficient number, since it is larger than the sum of its proper divisors (4979547).

9900549 is an frugal number, since it uses more digits than its factorization.

9900549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530 (or 506 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 9900549 is about 3146.5137851279. The cubic root of 9900549 is about 214.7268859491.

The spelling of 9900549 in words is "nine million, nine hundred thousand, five hundred forty-nine".