3205405109 has 2 divisors, whose sum is σ = 3205405110. Its totient is φ = 3205405108.

The previous prime is 3205405103. The next prime is 3205405111. The reversal of 3205405109 is 9015045023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3149678884 + 55726225 = 56122^2 + 7465^2 .

It is a cyclic number.

It is not a de Polignac number, because 3205405109 - 2¹² = 3205401013 is a prime.

Together with 3205405111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3205405103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1602702554 + 1602702555.

It is an arithmetic number, because the mean of its divisors is an integer number (1602702555).

Almost surely, 2^3205405109 is an apocalyptic number.

It is an amenable number.

3205405109 is a deficient number, since it is larger than the sum of its proper divisors (1).

3205405109 is an equidigital number, since it uses as much as digits as its factorization.

3205405109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 3205405109 is about 56616.2972031905. The cubic root of 3205405109 is about 1474.4418240765.

The spelling of 3205405109 in words is "three billion, two hundred five million, four hundred five thousand, one hundred nine".