8191128423 has 4 divisors (see below), whose sum is σ = 10921504568. Its totient is φ = 5460752280.

The previous prime is 8191128409. The next prime is 8191128433. The reversal of 8191128423 is 3248211918.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 8191128423 - 2¹⁸ = 8190866279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8191128433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1365188068 + ... + 1365188073.

It is an arithmetic number, because the mean of its divisors is an integer number (2730376142).

Almost surely, 2^8191128423 is an apocalyptic number.

8191128423 is a deficient number, since it is larger than the sum of its proper divisors (2730376145).

8191128423 is a wasteful number, since it uses less digits than its factorization.

8191128423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2730376144.

The product of its digits is 27648, while the sum is 39.

The square root of 8191128423 is about 90504.8530356246. The cubic root of 8191128423 is about 2015.8021852253.

The spelling of 8191128423 in words is "eight billion, one hundred ninety-one million, one hundred twenty-eight thousand, four hundred twenty-three".