8917541921 has 4 divisors (see below), whose sum is σ = 8918016432. Its totient is φ = 8917067412.

The previous prime is 8917541917. The next prime is 8917541923. The reversal of 8917541921 is 1291457198.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8917541921 - 2² = 8917541917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8917541923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207851 + ... + 247056.

It is an arithmetic number, because the mean of its divisors is an integer number (2229504108).

Almost surely, 2^8917541921 is an apocalyptic number.

It is an amenable number.

8917541921 is a deficient number, since it is larger than the sum of its proper divisors (474511).

8917541921 is a wasteful number, since it uses less digits than its factorization.

8917541921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474510.

The product of its digits is 181440, while the sum is 47.

The square root of 8917541921 is about 94432.7375490089. The cubic root of 8917541921 is about 2073.7117408084.

The spelling of 8917541921 in words is "eight billion, nine hundred seventeen million, five hundred forty-one thousand, nine hundred twenty-one".