2189677709 has 8 divisors (see below), whose sum is σ = 2218553400. Its totient is φ = 2160930816.

The previous prime is 2189677663. The next prime is 2189677729. The reversal of 2189677709 is 9077769812.

It can be written as a sum of positive squares in 4 ways, for example, as 384277609 + 1805400100 = 19603^2 + 42490^2 .

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-2189677709 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 (2189677729) by changing a digit.

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, 2267 + ... + 66215.

It is an arithmetic number, because the mean of its divisors is an integer number (277319175).

Almost surely, 2^2189677709 is an apocalyptic number.

It is an amenable number.

2189677709 is a deficient number, since it is larger than the sum of its proper divisors (28875691).

2189677709 is an equidigital number, since it uses as much as digits as its factorization.

2189677709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64399.

The product of its (nonzero) digits is 2667168, while the sum is 56.

The square root of 2189677709 is about 46793.9922319094. The cubic root of 2189677709 is about 1298.5541536851.

The spelling of 2189677709 in words is "two billion, one hundred eighty-nine million, six hundred seventy-seven thousand, seven hundred nine".