8981997913 has 4 divisors (see below), whose sum is σ = 10265140480. Its totient is φ = 7698855348.

The previous prime is 8981997907. The next prime is 8981997917. The reversal of 8981997913 is 3197991898.

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 8981997913 - 2¹³ = 8981989721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8981997917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 641571273 + ... + 641571286.

It is an arithmetic number, because the mean of its divisors is an integer number (2566285120).

Almost surely, 2^8981997913 is an apocalyptic number.

It is an amenable number.

8981997913 is a deficient number, since it is larger than the sum of its proper divisors (1283142567).

8981997913 is a wasteful number, since it uses less digits than its factorization.

8981997913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283142566.

The product of its digits is 8817984, while the sum is 64.

The square root of 8981997913 is about 94773.4029831155. The cubic root of 8981997913 is about 2078.6960139954.

The spelling of 8981997913 in words is "eight billion, nine hundred eighty-one million, nine hundred ninety-seven thousand, nine hundred thirteen".