8791311393 has 6 divisors (see below), whose sum is σ = 12698560914. Its totient is φ = 5860874256.

The previous prime is 8791311349. The next prime is 8791311427. The reversal of 8791311393 is 3931131978.

It can be written as a sum of positive squares in only one way, i.e., 7646977809 + 1144333584 = 87447^2 + 33828^2 .

It is not a de Polignac number, because 8791311393 - 2⁶ = 8791311329 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8791311323) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 488406180 + ... + 488406197.

It is an arithmetic number, because the mean of its divisors is an integer number (2116426819).

Almost surely, 2^8791311393 is an apocalyptic number.

It is an amenable number.

8791311393 is a deficient number, since it is larger than the sum of its proper divisors (3907249521).

8791311393 is a wasteful number, since it uses less digits than its factorization.

8791311393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976812383 (or 976812380 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 8791311393 is about 93761.9933288537. The cubic root of 8791311393 is about 2063.8805316927.

The spelling of 8791311393 in words is "eight billion, seven hundred ninety-one million, three hundred eleven thousand, three hundred ninety-three".