8991545897 has 8 divisors (see below), whose sum is σ = 9145517280. Its totient is φ = 8837627040.

The previous prime is 8991545887. The next prime is 8991545933. The reversal of 8991545897 is 7985451998.

It is a happy number.

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 8991545897 - 2¹⁰ = 8991544873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8991545867) 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, 505322 + ... + 522812.

It is an arithmetic number, because the mean of its divisors is an integer number (1143189660).

Almost surely, 2^8991545897 is an apocalyptic number.

It is an amenable number.

8991545897 is a deficient number, since it is larger than the sum of its proper divisors (153971383).

8991545897 is a wasteful number, since it uses less digits than its factorization.

8991545897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26263.

The product of its digits is 32659200, while the sum is 65.

The square root of 8991545897 is about 94823.7623014400. The cubic root of 8991545897 is about 2079.4323137198.

The spelling of 8991545897 in words is "eight billion, nine hundred ninety-one million, five hundred forty-five thousand, eight hundred ninety-seven".