2540781791 has 2 divisors, whose sum is σ = 2540781792. Its totient is φ = 2540781790.

The previous prime is 2540781781. The next prime is 2540781827. The reversal of 2540781791 is 1971870452.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2540781791 - 2³⁰ = 1467039967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2540781781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1270390895 + 1270390896.

It is an arithmetic number, because the mean of its divisors is an integer number (1270390896).

Almost surely, 2^2540781791 is an apocalyptic number.

2540781791 is a deficient number, since it is larger than the sum of its proper divisors (1).

2540781791 is an equidigital number, since it uses as much as digits as its factorization.

2540781791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141120, while the sum is 44.

The square root of 2540781791 is about 50406.1681840626. The cubic root of 2540781791 is about 1364.5489600052.

The spelling of 2540781791 in words is "two billion, five hundred forty million, seven hundred eighty-one thousand, seven hundred ninety-one".