6989819 has 2 divisors, whose sum is σ = 6989820. Its totient is φ = 6989818.

The previous prime is 6989813. The next prime is 6989821. The reversal of 6989819 is 9189896.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6989819 is a prime.

It is a super-2 number, since 2×6989819² = 97715139305522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 6989821, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6989813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3494909 + 3494910.

It is an arithmetic number, because the mean of its divisors is an integer number (3494910).

Almost surely, 2^6989819 is an apocalyptic number.

6989819 is a deficient number, since it is larger than the sum of its proper divisors (1).

6989819 is an equidigital number, since it uses as much as digits as its factorization.

6989819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 50.

The square root of 6989819 is about 2643.8265828151. The cubic root of 6989819 is about 191.2003325537.

The spelling of 6989819 in words is "six million, nine hundred eighty-nine thousand, eight hundred nineteen".