2189734009 has 2 divisors, whose sum is σ = 2189734010. Its totient is φ = 2189734008.

The previous prime is 2189734007. The next prime is 2189734033. The reversal of 2189734009 is 9004379812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1274490000 + 915244009 = 35700^2 + 30253^2 .

It is a cyclic number.

It is not a de Polignac number, because 2189734009 - 2¹ = 2189734007 is a prime.

Together with 2189734007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2189734007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094867004 + 1094867005.

It is an arithmetic number, because the mean of its divisors is an integer number (1094867005).

Almost surely, 2^2189734009 is an apocalyptic number.

It is an amenable number.

2189734009 is a deficient number, since it is larger than the sum of its proper divisors (1).

2189734009 is an equidigital number, since it uses as much as digits as its factorization.

2189734009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 2189734009 is about 46794.5938009937. The cubic root of 2189734009 is about 1298.5652828682.

The spelling of 2189734009 in words is "two billion, one hundred eighty-nine million, seven hundred thirty-four thousand, nine".