8491831 has 2 divisors, whose sum is σ = 8491832. Its totient is φ = 8491830.

The previous prime is 8491829. The next prime is 8491897. The reversal of 8491831 is 1381948.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8491831 - 2¹ = 8491829 is a prime.

It is a super-2 number, since 2×8491831² = 144222387465122, which contains 22 as substring.

Together with 8491829, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8491801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4245915 + 4245916.

It is an arithmetic number, because the mean of its divisors is an integer number (4245916).

Almost surely, 2^8491831 is an apocalyptic number.

8491831 is a deficient number, since it is larger than the sum of its proper divisors (1).

8491831 is an equidigital number, since it uses as much as digits as its factorization.

8491831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 34.

The square root of 8491831 is about 2914.0746387147. The cubic root of 8491831 is about 204.0173556296.

The spelling of 8491831 in words is "eight million, four hundred ninety-one thousand, eight hundred thirty-one".