8191231 has 4 divisors (see below), whose sum is σ = 8230264. Its totient is φ = 8152200.

The previous prime is 8191217. The next prime is 8191259. The reversal of 8191231 is 1321918.

8191231 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 a de Polignac number, because none of the positive numbers 2^k-8191231 is a prime.

It is a super-2 number, since 2×8191231² = 134192530590722, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 8191196 and 8191205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8191291) 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, 19200 + ... + 19621.

It is an arithmetic number, because the mean of its divisors is an integer number (2057566).

Almost surely, 2^8191231 is an apocalyptic number.

8191231 is a deficient number, since it is larger than the sum of its proper divisors (39033).

8191231 is a wasteful number, since it uses less digits than its factorization.

8191231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39032.

The product of its digits is 432, while the sum is 25.

The square root of 8191231 is about 2862.0326692755. The cubic root of 8191231 is about 201.5810599779.

The spelling of 8191231 in words is "eight million, one hundred ninety-one thousand, two hundred thirty-one".