2139706909 has 2 divisors, whose sum is σ = 2139706910. Its totient is φ = 2139706908.

The previous prime is 2139706889. The next prime is 2139706931. The reversal of 2139706909 is 9096079312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1075512025 + 1064194884 = 32795^2 + 32622^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2139706909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2139706949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069853454 + 1069853455.

It is an arithmetic number, because the mean of its divisors is an integer number (1069853455).

Almost surely, 2^2139706909 is an apocalyptic number.

It is an amenable number.

2139706909 is a deficient number, since it is larger than the sum of its proper divisors (1).

2139706909 is an equidigital number, since it uses as much as digits as its factorization.

2139706909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 183708, while the sum is 46.

The square root of 2139706909 is about 46256.9660591786. The cubic root of 2139706909 is about 1288.5999089714.

The spelling of 2139706909 in words is "two billion, one hundred thirty-nine million, seven hundred six thousand, nine hundred nine".