8981371921 has 8 divisors (see below), whose sum is σ = 9054828288. Its totient is φ = 8907990000.

The previous prime is 8981371879. The next prime is 8981371981. The reversal of 8981371921 is 1291731898.

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 8981371921 - 2⁹ = 8981371409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8981371981) 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, 238011 + ... + 273151.

It is an arithmetic number, because the mean of its divisors is an integer number (1131853536).

Almost surely, 2^8981371921 is an apocalyptic number.

It is an amenable number.

8981371921 is a deficient number, since it is larger than the sum of its proper divisors (73456367).

8981371921 is a wasteful number, since it uses less digits than its factorization.

8981371921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37223.

The product of its digits is 217728, while the sum is 49.

The square root of 8981371921 is about 94770.1003534343. The cubic root of 8981371921 is about 2078.6477219443.

The spelling of 8981371921 in words is "eight billion, nine hundred eighty-one million, three hundred seventy-one thousand, nine hundred twenty-one".