2164445309 has 8 divisors (see below), whose sum is σ = 2387793912. Its totient is φ = 1949218560.

The previous prime is 2164445303. The next prime is 2164445347. The reversal of 2164445309 is 9035444612.

It can be written as a sum of positive squares in 4 ways, for example, as 19829209 + 2144616100 = 4453^2 + 46310^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2164445309 - 2²⁰ = 2163396733 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2164445303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2029904 + ... + 2030969.

It is an arithmetic number, because the mean of its divisors is an integer number (298474239).

Almost surely, 2^2164445309 is an apocalyptic number.

It is an amenable number.

2164445309 is a deficient number, since it is larger than the sum of its proper divisors (223348603).

2164445309 is a wasteful number, since it uses less digits than its factorization.

2164445309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4060927.

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 2164445309 is about 46523.5994845627. The cubic root of 2164445309 is about 1293.5469774882.

The spelling of 2164445309 in words is "two billion, one hundred sixty-four million, four hundred forty-five thousand, three hundred nine".