6428191 has 16 divisors (see below), whose sum is σ = 8275968. Its totient is φ = 4845600.

The previous prime is 6428189. The next prime is 6428197. The reversal of 6428191 is 1918246.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 6428191 - 2¹ = 6428189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6428197) 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 in 15 ways as a sum of consecutive naturals, for example, 1041 + ... + 3733.

It is an arithmetic number, because the mean of its divisors is an integer number (517248).

Almost surely, 2^6428191 is an apocalyptic number.

6428191 is a deficient number, since it is larger than the sum of its proper divisors (1847777).

6428191 is a wasteful number, since it uses less digits than its factorization.

6428191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2742.

The product of its digits is 3456, while the sum is 31.

The square root of 6428191 is about 2535.3877415496. The cubic root of 6428191 is about 185.9357603726.

The spelling of 6428191 in words is "six million, four hundred twenty-eight thousand, one hundred ninety-one".