8991481 has 8 divisors (see below), whose sum is σ = 9272000. Its totient is φ = 8713008.

The previous prime is 8991449. The next prime is 8991517. The reversal of 8991481 is 1841998.

8991481 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 8991481 - 2⁵ = 8991449 is a prime.

It is a super-2 number, since 2×8991481² = 161693461146722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8991401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17770 + ... + 18268.

It is an arithmetic number, because the mean of its divisors is an integer number (1159000).

Almost surely, 2^8991481 is an apocalyptic number.

It is an amenable number.

8991481 is a deficient number, since it is larger than the sum of its proper divisors (280519).

8991481 is a wasteful number, since it uses less digits than its factorization.

8991481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023.

The product of its digits is 20736, while the sum is 40.

The square root of 8991481 is about 2998.5798305198. The cubic root of 8991481 is about 207.9427310900.

The spelling of 8991481 in words is "eight million, nine hundred ninety-one thousand, four hundred eighty-one".