47781139891 has 2 divisors, whose sum is σ = 47781139892. Its totient is φ = 47781139890.

The previous prime is 47781139841. The next prime is 47781139897. The reversal of 47781139891 is 19893118774.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 47781139891 - 2⁹ = 47781139379 is a prime.

It is a super-2 number, since 2×47781139891² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (47781139897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23890569945 + 23890569946.

It is an arithmetic number, because the mean of its divisors is an integer number (23890569946).

Almost surely, 2^47781139891 is an apocalyptic number.

47781139891 is a deficient number, since it is larger than the sum of its proper divisors (1).

47781139891 is an equidigital number, since it uses as much as digits as its factorization.

47781139891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3048192, while the sum is 58.

The spelling of 47781139891 in words is "forty-seven billion, seven hundred eighty-one million, one hundred thirty-nine thousand, eight hundred ninety-one".