6920509 has 2 divisors, whose sum is σ = 6920510. Its totient is φ = 6920508.

The previous prime is 6920489. The next prime is 6920521. The reversal of 6920509 is 9050296.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5654884 + 1265625 = 2378^2 + 1125^2 .

It is a cyclic number.

It is not a de Polignac number, because 6920509 - 2⁵ = 6920477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6920569) 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, 3460254 + 3460255.

It is an arithmetic number, because the mean of its divisors is an integer number (3460255).

Almost surely, 2^6920509 is an apocalyptic number.

It is an amenable number.

6920509 is a deficient number, since it is larger than the sum of its proper divisors (1).

6920509 is an equidigital number, since it uses as much as digits as its factorization.

6920509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 6920509 is about 2630.6860321977. The cubic root of 6920509 is about 190.5662608234.

The spelling of 6920509 in words is "six million, nine hundred twenty thousand, five hundred nine".