2163694009 has 4 divisors (see below), whose sum is σ = 2170114804. Its totient is φ = 2157273216.

The previous prime is 2163693997. The next prime is 2163694033. The reversal of 2163694009 is 9004963612.

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 174979984 + 1988714025 = 13228^2 + 44595^2 .

It is a cyclic number.

It is not a de Polignac number, because 2163694009 - 2¹⁷ = 2163562937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2163694069) 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 in 3 ways as a sum of consecutive naturals, for example, 3209892 + ... + 3210565.

It is an arithmetic number, because the mean of its divisors is an integer number (542528701).

Almost surely, 2^2163694009 is an apocalyptic number.

It is an amenable number.

2163694009 is a deficient number, since it is larger than the sum of its proper divisors (6420795).

2163694009 is an equidigital number, since it uses as much as digits as its factorization.

2163694009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6420794.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 2163694009 is about 46515.5243870259. The cubic root of 2163694009 is about 1293.3972925925.

The spelling of 2163694009 in words is "two billion, one hundred sixty-three million, six hundred ninety-four thousand, nine".