2111949709 has 2 divisors, whose sum is σ = 2111949710. Its totient is φ = 2111949708.

The previous prime is 2111949703. The next prime is 2111949727. The reversal of 2111949709 is 9079491112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1478018025 + 633931684 = 38445^2 + 25178^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111949709 - 2⁹ = 2111949197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2111949703) 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, 1055974854 + 1055974855.

It is an arithmetic number, because the mean of its divisors is an integer number (1055974855).

Almost surely, 2^2111949709 is an apocalyptic number.

It is an amenable number.

2111949709 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111949709 is an equidigital number, since it uses as much as digits as its factorization.

2111949709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 2111949709 is about 45955.9540103347. The cubic root of 2111949709 is about 1283.0035481985.

The spelling of 2111949709 in words is "two billion, one hundred eleven million, nine hundred forty-nine thousand, seven hundred nine".