47781139897 has 2 divisors, whose sum is σ = 47781139898. Its totient is φ = 47781139896.

The previous prime is 47781139891. The next prime is 47781139909. The reversal of 47781139897 is 79893118774.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28930948281 + 18850191616 = 170091^2 + 137296^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47781139897 is a prime.

It is not a weakly prime, because it can be changed into another prime (47781139891) 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, 23890569948 + 23890569949.

It is an arithmetic number, because the mean of its divisors is an integer number (23890569949).

Almost surely, 2^47781139897 is an apocalyptic number.

It is an amenable number.

47781139897 is a deficient number, since it is larger than the sum of its proper divisors (1).

47781139897 is an equidigital number, since it uses as much as digits as its factorization.

47781139897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21337344, while the sum is 64.

The spelling of 47781139897 in words is "forty-seven billion, seven hundred eighty-one million, one hundred thirty-nine thousand, eight hundred ninety-seven".