1909969505 has 16 divisors (see below), whose sum is σ = 2314762704. Its totient is φ = 1512806400.

The previous prime is 1909969487. The next prime is 1909969553. The reversal of 1909969505 is 5059699091.

It can be written as a sum of positive squares in 8 ways, for example, as 507916369 + 1402053136 = 22537^2 + 37444^2 .

It is not a de Polignac number, because 1909969505 - 2⁶ = 1909969441 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 1016627 + ... + 1018503.

It is an arithmetic number, because the mean of its divisors is an integer number (144672669).

Almost surely, 2^1909969505 is an apocalyptic number.

It is an amenable number.

1909969505 is a deficient number, since it is larger than the sum of its proper divisors (404793199).

1909969505 is a wasteful number, since it uses less digits than its factorization.

1909969505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3796.

The product of its (nonzero) digits is 984150, while the sum is 53.

The square root of 1909969505 is about 43703.1978807043. The cubic root of 1909969505 is about 1240.7248417767.

The spelling of 1909969505 in words is "one billion, nine hundred nine million, nine hundred sixty-nine thousand, five hundred five".