6900605209 has 2 divisors, whose sum is σ = 6900605210. Its totient is φ = 6900605208.

The previous prime is 6900605161. The next prime is 6900605227. The reversal of 6900605209 is 9025060096.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5391671184 + 1508934025 = 73428^2 + 38845^2 .

It is a cyclic number.

It is not a de Polignac number, because 6900605209 - 2³¹ = 4753121561 is a prime.

It is not a weakly prime, because it can be changed into another prime (6900605279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3450302604 + 3450302605.

It is an arithmetic number, because the mean of its divisors is an integer number (3450302605).

Almost surely, 2^6900605209 is an apocalyptic number.

It is an amenable number.

6900605209 is a deficient number, since it is larger than the sum of its proper divisors (1).

6900605209 is an equidigital number, since it uses as much as digits as its factorization.

6900605209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 6900605209 is about 83069.8814793906. The cubic root of 6900605209 is about 1903.8339213862.

The spelling of 6900605209 in words is "six billion, nine hundred million, six hundred five thousand, two hundred nine".