47927956691981 has 2 divisors, whose sum is σ = 47927956691982. Its totient is φ = 47927956691980.

The previous prime is 47927956691963. The next prime is 47927956692013. The reversal of 47927956691981 is 18919665972974.

47927956691981 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 can be written as a sum of positive squares in only one way, i.e., 33985693575625 + 13942263116356 = 5829725^2 + 3733934^2 .

It is a cyclic number.

It is not a de Polignac number, because 47927956691981 - 2¹⁴ = 47927956675597 is a prime.

It is a super-2 number, since 2×47927956691981² (a number of 28 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 47927956691981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47927956690981) 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, 23963978345990 + 23963978345991.

It is an arithmetic number, because the mean of its divisors is an integer number (23963978345991).

Almost surely, 2^{47927956691981} is an apocalyptic number.

It is an amenable number.

47927956691981 is a deficient number, since it is larger than the sum of its proper divisors (1).

47927956691981 is an equidigital number, since it uses as much as digits as its factorization.

47927956691981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3703553280, while the sum is 83.

The spelling of 47927956691981 in words is "forty-seven trillion, nine hundred twenty-seven billion, nine hundred fifty-six million, six hundred ninety-one thousand, nine hundred eighty-one".