8427491 has 2 divisors, whose sum is σ = 8427492. Its totient is φ = 8427490.

The previous prime is 8427481. The next prime is 8427521. The reversal of 8427491 is 1947248.

8427491 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8427491 - 2¹⁸ = 8165347 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8427401) 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, 4213745 + 4213746.

It is an arithmetic number, because the mean of its divisors is an integer number (4213746).

Almost surely, 2^8427491 is an apocalyptic number.

8427491 is a deficient number, since it is larger than the sum of its proper divisors (1).

8427491 is an equidigital number, since it uses as much as digits as its factorization.

8427491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 35.

The square root of 8427491 is about 2903.0141232863. The cubic root of 8427491 is about 203.5007898196.

The spelling of 8427491 in words is "eight million, four hundred twenty-seven thousand, four hundred ninety-one".