2188870945 has 8 divisors (see below), whose sum is σ = 2627832744. Its totient is φ = 1750305024.

The previous prime is 2188870919. The next prime is 2188870951. The reversal of 2188870945 is 5490788812.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 176810209 + 2012060736 = 13297^2 + 44856^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2188870945 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2188870892 and 2188870901.

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 7 ways as a sum of consecutive naturals, for example, 86664 + ... + 109033.

It is an arithmetic number, because the mean of its divisors is an integer number (328479093).

Almost surely, 2^2188870945 is an apocalyptic number.

It is an amenable number.

2188870945 is a deficient number, since it is larger than the sum of its proper divisors (438961799).

2188870945 is a wasteful number, since it uses less digits than its factorization.

2188870945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197939.

The product of its (nonzero) digits is 1290240, while the sum is 52.

The square root of 2188870945 is about 46785.3710576287. The cubic root of 2188870945 is about 1298.3946544998.

The spelling of 2188870945 in words is "two billion, one hundred eighty-eight million, eight hundred seventy thousand, nine hundred forty-five".