8191148831 has 4 divisors (see below), whose sum is σ = 8191336272. Its totient is φ = 8190961392.

The previous prime is 8191148773. The next prime is 8191148873. The reversal of 8191148831 is 1388411918.

It is a happy number.

8191148831 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 8191148831 - 2¹⁸ = 8190886687 is a prime.

It is a super-2 number, since 2×8191148831² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8191148531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10355 + ... + 128411.

It is an arithmetic number, because the mean of its divisors is an integer number (2047834068).

Almost surely, 2^8191148831 is an apocalyptic number.

8191148831 is a deficient number, since it is larger than the sum of its proper divisors (187441).

8191148831 is a wasteful number, since it uses less digits than its factorization.

8191148831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187440.

The product of its digits is 55296, while the sum is 44.

The square root of 8191148831 is about 90504.9657808896. The cubic root of 8191148831 is about 2015.8038593315.

The spelling of 8191148831 in words is "eight billion, one hundred ninety-one million, one hundred forty-eight thousand, eight hundred thirty-one".