6698009 has 2 divisors, whose sum is σ = 6698010. Its totient is φ = 6698008.

The previous prime is 6697979. The next prime is 6698033. The reversal of 6698009 is 9008966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5382400 + 1315609 = 2320^2 + 1147^2 .

It is a cyclic number.

It is not a de Polignac number, because 6698009 - 2¹² = 6693913 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (6698039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3349004 + 3349005.

It is an arithmetic number, because the mean of its divisors is an integer number (3349005).

Almost surely, 2^6698009 is an apocalyptic number.

It is an amenable number.

6698009 is a deficient number, since it is larger than the sum of its proper divisors (1).

6698009 is an equidigital number, since it uses as much as digits as its factorization.

6698009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 6698009 is about 2588.0511973298. The cubic root of 6698009 is about 188.5016874191.

The spelling of 6698009 in words is "six million, six hundred ninety-eight thousand, nine".