2561038771 has 2 divisors, whose sum is σ = 2561038772. Its totient is φ = 2561038770.

The previous prime is 2561038769. The next prime is 2561038841. The reversal of 2561038771 is 1778301652.

2561038771 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 2561038771 - 2¹ = 2561038769 is a prime.

Together with 2561038769, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2561038171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280519385 + 1280519386.

It is an arithmetic number, because the mean of its divisors is an integer number (1280519386).

Almost surely, 2^2561038771 is an apocalyptic number.

2561038771 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561038771 is an equidigital number, since it uses as much as digits as its factorization.

2561038771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 2561038771 is about 50606.7067788450. The cubic root of 2561038771 is about 1368.1657608023.

The spelling of 2561038771 in words is "two billion, five hundred sixty-one million, thirty-eight thousand, seven hundred seventy-one".