6228991 has 2 divisors, whose sum is σ = 6228992. Its totient is φ = 6228990.

The previous prime is 6228983. The next prime is 6229033. The reversal of 6228991 is 1998226.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6228991 - 2³ = 6228983 is a prime.

It is a Chen prime.

6228991 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6228991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6228961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3114495 + 3114496.

It is an arithmetic number, because the mean of its divisors is an integer number (3114496).

Almost surely, 2^6228991 is an apocalyptic number.

6228991 is a deficient number, since it is larger than the sum of its proper divisors (1).

6228991 is an equidigital number, since it uses as much as digits as its factorization.

6228991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 37.

The square root of 6228991 is about 2495.7946630282. The cubic root of 6228991 is about 183.9949490579.

The spelling of 6228991 in words is "six million, two hundred twenty-eight thousand, nine hundred ninety-one".