6427891 has 2 divisors, whose sum is σ = 6427892. Its totient is φ = 6427890.

The previous prime is 6427831. The next prime is 6427907. The reversal of 6427891 is 1987246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6427891 - 2¹⁷ = 6296819 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6427891.

It is not a weakly prime, because it can be changed into another prime (6427831) 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, 3213945 + 3213946.

It is an arithmetic number, because the mean of its divisors is an integer number (3213946).

Almost surely, 2^6427891 is an apocalyptic number.

6427891 is a deficient number, since it is larger than the sum of its proper divisors (1).

6427891 is an equidigital number, since it uses as much as digits as its factorization.

6427891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 37.

The square root of 6427891 is about 2535.3285783109. The cubic root of 6427891 is about 185.9328678224.

The spelling of 6427891 in words is "six million, four hundred twenty-seven thousand, eight hundred ninety-one".