2169194905 has 4 divisors (see below), whose sum is σ = 2603033892. Its totient is φ = 1735355920.

The previous prime is 2169194891. The next prime is 2169194977. The reversal of 2169194905 is 5094919612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1558907289 + 610287616 = 39483^2 + 24704^2 .

It is not a de Polignac number, because 2169194905 - 2²⁹ = 1632323993 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216919486 + ... + 216919495.

It is an arithmetic number, because the mean of its divisors is an integer number (650758473).

Almost surely, 2^2169194905 is an apocalyptic number.

It is an amenable number.

2169194905 is a deficient number, since it is larger than the sum of its proper divisors (433838987).

2169194905 is an equidigital number, since it uses as much as digits as its factorization.

2169194905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433838986.

The product of its (nonzero) digits is 174960, while the sum is 46.

The square root of 2169194905 is about 46574.6165308959. The cubic root of 2169194905 is about 1294.4924602332.

The spelling of 2169194905 in words is "two billion, one hundred sixty-nine million, one hundred ninety-four thousand, nine hundred five".