6997 has 2 divisors, whose sum is σ = 6998. Its totient is φ = 6996.

The previous prime is 6991. The next prime is 7001. The reversal of 6997 is 7996.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5476 + 1521 = 74^2 + 39^2 .

6997 is a truncatable prime.

It is a cyclic number.

It is not a de Polignac number, because 6997 - 2⁷ = 6869 is a prime.

It is a Chen prime.

It is a plaindrome in base 14.

It is a nialpdrome in base 6.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 6997.

It is not a weakly prime, because it can be changed into another prime (6991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3498 + 3499.

It is an arithmetic number, because the mean of its divisors is an integer number (3499).

It is an amenable number.

6997 is a deficient number, since it is larger than the sum of its proper divisors (1).

6997 is an equidigital number, since it uses as much as digits as its factorization.

6997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3402, while the sum is 31.

The square root of 6997 is about 83.6480723030. The cubic root of 6997 is about 19.1265786784.

Subtracting 6997 from its reverse (7996), we obtain a palindrome (999).

The spelling of 6997 in words is "six thousand, nine hundred ninety-seven".