2189949109 has 2 divisors, whose sum is σ = 2189949110. Its totient is φ = 2189949108.

The previous prime is 2189949077. The next prime is 2189949143. The reversal of 2189949109 is 9019499812.

2189949109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2172958225 + 16990884 = 46615^2 + 4122^2 .

It is a cyclic number.

It is not a de Polignac number, because 2189949109 - 2⁵ = 2189949077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2189949149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094974554 + 1094974555.

It is an arithmetic number, because the mean of its divisors is an integer number (1094974555).

Almost surely, 2^2189949109 is an apocalyptic number.

It is an amenable number.

2189949109 is a deficient number, since it is larger than the sum of its proper divisors (1).

2189949109 is an equidigital number, since it uses as much as digits as its factorization.

2189949109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 52.

The square root of 2189949109 is about 46796.8920869752. The cubic root of 2189949109 is about 1298.6078013119.

The spelling of 2189949109 in words is "two billion, one hundred eighty-nine million, nine hundred forty-nine thousand, one hundred nine".