2119981909 has 2 divisors, whose sum is σ = 2119981910. Its totient is φ = 2119981908.

The previous prime is 2119981883. The next prime is 2119981937. The reversal of 2119981909 is 9091899112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1402277809 + 717704100 = 37447^2 + 26790^2 .

It is a cyclic number.

It is not a de Polignac number, because 2119981909 - 2²¹ = 2117884757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2119981939) 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 as a sum of consecutive naturals, namely, 1059990954 + 1059990955.

It is an arithmetic number, because the mean of its divisors is an integer number (1059990955).

Almost surely, 2^2119981909 is an apocalyptic number.

It is an amenable number.

2119981909 is a deficient number, since it is larger than the sum of its proper divisors (1).

2119981909 is an equidigital number, since it uses as much as digits as its factorization.

2119981909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 49.

The square root of 2119981909 is about 46043.2612767601. The cubic root of 2119981909 is about 1284.6280035714.

The spelling of 2119981909 in words is "two billion, one hundred nineteen million, nine hundred eighty-one thousand, nine hundred nine".