2145708809 has 4 divisors (see below), whose sum is σ = 2172869760. Its totient is φ = 2118547860.

The previous prime is 2145708797. The next prime is 2145708827. The reversal of 2145708809 is 9088075412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2145708809 - 2⁸ = 2145708553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2145708809.

It is not an unprimeable number, because it can be changed into a prime (2145708889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13580357 + ... + 13580514.

It is an arithmetic number, because the mean of its divisors is an integer number (543217440).

Almost surely, 2^2145708809 is an apocalyptic number.

It is an amenable number.

2145708809 is a deficient number, since it is larger than the sum of its proper divisors (27160951).

2145708809 is an equidigital number, since it uses as much as digits as its factorization.

2145708809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27160950.

The product of its (nonzero) digits is 161280, while the sum is 44.

The square root of 2145708809 is about 46321.7962626667. The cubic root of 2145708809 is about 1289.8036295445.

The spelling of 2145708809 in words is "two billion, one hundred forty-five million, seven hundred eight thousand, eight hundred nine".