2139706771 has 2 divisors, whose sum is σ = 2139706772. Its totient is φ = 2139706770.

The previous prime is 2139706763. The next prime is 2139706783. The reversal of 2139706771 is 1776079312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2139706771 - 2³ = 2139706763 is a prime.

It is not a weakly prime, because it can be changed into another prime (2139706711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069853385 + 1069853386.

It is an arithmetic number, because the mean of its divisors is an integer number (1069853386).

Almost surely, 2^2139706771 is an apocalyptic number.

2139706771 is a deficient number, since it is larger than the sum of its proper divisors (1).

2139706771 is an equidigital number, since it uses as much as digits as its factorization.

2139706771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 111132, while the sum is 43.

The square root of 2139706771 is about 46256.9645675113. The cubic root of 2139706771 is about 1288.5998812688.

The spelling of 2139706771 in words is "two billion, one hundred thirty-nine million, seven hundred six thousand, seven hundred seventy-one".