6905920409 has 2 divisors, whose sum is σ = 6905920410. Its totient is φ = 6905920408.

The previous prime is 6905920369. The next prime is 6905920447. The reversal of 6905920409 is 9040295096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6411525184 + 494395225 = 80072^2 + 22235^2 .

It is a cyclic number.

It is not a de Polignac number, because 6905920409 - 2¹⁶ = 6905854873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6905920409.

It is not a weakly prime, because it can be changed into another prime (6905920309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3452960204 + 3452960205.

It is an arithmetic number, because the mean of its divisors is an integer number (3452960205).

Almost surely, 2^6905920409 is an apocalyptic number.

It is an amenable number.

6905920409 is a deficient number, since it is larger than the sum of its proper divisors (1).

6905920409 is an equidigital number, since it uses as much as digits as its factorization.

6905920409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 174960, while the sum is 44.

The square root of 6905920409 is about 83101.8676625261. The cubic root of 6905920409 is about 1904.3226061097.

The spelling of 6905920409 in words is "six billion, nine hundred five million, nine hundred twenty thousand, four hundred nine".