2639561839 has 2 divisors, whose sum is σ = 2639561840. Its totient is φ = 2639561838.

The previous prime is 2639561801. The next prime is 2639561843. The reversal of 2639561839 is 9381659362.

2639561839 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2639561839 - 2²⁵ = 2606007407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2639561879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319780919 + 1319780920.

It is an arithmetic number, because the mean of its divisors is an integer number (1319780920).

Almost surely, 2^2639561839 is an apocalyptic number.

2639561839 is a deficient number, since it is larger than the sum of its proper divisors (1).

2639561839 is an equidigital number, since it uses as much as digits as its factorization.

2639561839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2099520, while the sum is 52.

The square root of 2639561839 is about 51376.6662892796. Note that the first 3 decimals coincide. The cubic root of 2639561839 is about 1382.0081802073.

The spelling of 2639561839 in words is "two billion, six hundred thirty-nine million, five hundred sixty-one thousand, eight hundred thirty-nine".