6918997 has 2 divisors, whose sum is σ = 6918998. Its totient is φ = 6918996.

The previous prime is 6918979. The next prime is 6919009. The reversal of 6918997 is 7998196.

Together with previous prime (6918979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4626801 + 2292196 = 2151^2 + 1514^2 .

It is a cyclic number.

It is not a de Polignac number, because 6918997 - 2¹⁹ = 6394709 is a prime.

It is a Chen prime.

6918997 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6918997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6918397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3459498 + 3459499.

It is an arithmetic number, because the mean of its divisors is an integer number (3459499).

Almost surely, 2^6918997 is an apocalyptic number.

It is an amenable number.

6918997 is a deficient number, since it is larger than the sum of its proper divisors (1).

6918997 is an equidigital number, since it uses as much as digits as its factorization.

6918997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 49.

The square root of 6918997 is about 2630.3986389899. The cubic root of 6918997 is about 190.5523814410.

The spelling of 6918997 in words is "six million, nine hundred eighteen thousand, nine hundred ninety-seven".