6221989 has 2 divisors, whose sum is σ = 6221990. Its totient is φ = 6221988.

The previous prime is 6221981. The next prime is 6222011. The reversal of 6221989 is 9891226.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5919489 + 302500 = 2433^2 + 550^2 .

It is a cyclic number.

It is not a de Polignac number, because 6221989 - 2³ = 6221981 is a prime.

It is a super-2 number, since 2×6221989² = 77426294232242, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6221981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3110994 + 3110995.

It is an arithmetic number, because the mean of its divisors is an integer number (3110995).

Almost surely, 2^6221989 is an apocalyptic number.

It is an amenable number.

6221989 is a deficient number, since it is larger than the sum of its proper divisors (1).

6221989 is an equidigital number, since it uses as much as digits as its factorization.

6221989 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 6221989 is about 2494.3915089657. The cubic root of 6221989 is about 183.9259803880.

The spelling of 6221989 in words is "six million, two hundred twenty-one thousand, nine hundred eighty-nine".