8981279991 has 12 divisors (see below), whose sum is σ = 12974312832. Its totient is φ = 5986895616.

The previous prime is 8981279977. The next prime is 8981279999. The reversal of 8981279991 is 1999721898.

It is not a de Polignac number, because 8981279991 - 2¹⁷ = 8981148919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8981279999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49495 + ... + 142871.

It is an arithmetic number, because the mean of its divisors is an integer number (1081192736).

Almost surely, 2^8981279991 is an apocalyptic number.

8981279991 is a deficient number, since it is larger than the sum of its proper divisors (3993032841).

8981279991 is a wasteful number, since it uses less digits than its factorization.

8981279991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104070 (or 104067 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 63.

The square root of 8981279991 is about 94769.6153363513. The cubic root of 8981279991 is about 2078.6406298305.

The spelling of 8981279991 in words is "eight billion, nine hundred eighty-one million, two hundred seventy-nine thousand, nine hundred ninety-one".