6711989 has 2 divisors, whose sum is σ = 6711990. Its totient is φ = 6711988.

The previous prime is 6711983. The next prime is 6712007. The reversal of 6711989 is 9891176.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6589489 + 122500 = 2567^2 + 350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6711989 is a prime.

It is a super-2 number, since 2×6711989² = 90101592672242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6711983) 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, 3355994 + 3355995.

It is an arithmetic number, because the mean of its divisors is an integer number (3355995).

Almost surely, 2^6711989 is an apocalyptic number.

It is an amenable number.

6711989 is a deficient number, since it is larger than the sum of its proper divisors (1).

6711989 is an equidigital number, since it uses as much as digits as its factorization.

6711989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 41.

The square root of 6711989 is about 2590.7506634178. The cubic root of 6711989 is about 188.6327423983.

The spelling of 6711989 in words is "six million, seven hundred eleven thousand, nine hundred eighty-nine".