8991549 has 18 divisors (see below), whose sum is σ = 15108990. Its totient is φ = 5137776.

The previous prime is 8991539. The next prime is 8991553. The reversal of 8991549 is 9451998.

8991549 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 can be written as a sum of positive squares in only one way, i.e., 8892324 + 99225 = 2982^2 + 315^2 .

It is not a de Polignac number, because 8991549 - 2⁴ = 8991533 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8991529) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9754 + ... + 10635.

Almost surely, 2^8991549 is an apocalyptic number.

It is an amenable number.

8991549 is a deficient number, since it is larger than the sum of its proper divisors (6117441).

8991549 is a wasteful number, since it uses less digits than its factorization.

8991549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20409 (or 20399 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 8991549 is about 2998.5911691993. The cubic root of 8991549 is about 207.9432552925.

The spelling of 8991549 in words is "eight million, nine hundred ninety-one thousand, five hundred forty-nine".