2561106139 has 2 divisors, whose sum is σ = 2561106140. Its totient is φ = 2561106138.

The previous prime is 2561106131. The next prime is 2561106169. The reversal of 2561106139 is 9316011652.

2561106139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2561106139 - 2³ = 2561106131 is a prime.

It is not a weakly prime, because it can be changed into another prime (2561106131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280553069 + 1280553070.

It is an arithmetic number, because the mean of its divisors is an integer number (1280553070).

Almost surely, 2^2561106139 is an apocalyptic number.

2561106139 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561106139 is an equidigital number, since it uses as much as digits as its factorization.

2561106139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 2561106139 is about 50607.3723779451. The cubic root of 2561106139 is about 1368.1777572084.

The spelling of 2561106139 in words is "two billion, five hundred sixty-one million, one hundred six thousand, one hundred thirty-nine".