5261381887 has 2 divisors, whose sum is σ = 5261381888. Its totient is φ = 5261381886.

The previous prime is 5261381837. The next prime is 5261381891. The reversal of 5261381887 is 7881831625.

5261381887 is digitally balanced in base 3, 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 a de Polignac number, because none of the positive numbers 2^k-5261381887 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 5261381887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5261381837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2630690943 + 2630690944.

It is an arithmetic number, because the mean of its divisors is an integer number (2630690944).

Almost surely, 2^5261381887 is an apocalyptic number.

5261381887 is a deficient number, since it is larger than the sum of its proper divisors (1).

5261381887 is an equidigital number, since it uses as much as digits as its factorization.

5261381887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 645120, while the sum is 49.

The square root of 5261381887 is about 72535.3836896173. The cubic root of 5261381887 is about 1739.2684077052.

The spelling of 5261381887 in words is "five billion, two hundred sixty-one million, three hundred eighty-one thousand, eight hundred eighty-seven".