47491075396781 has 2 divisors, whose sum is σ = 47491075396782. Its totient is φ = 47491075396780.

The previous prime is 47491075396729. The next prime is 47491075396799. The reversal of 47491075396781 is 18769357019474.

47491075396781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25038925139881 + 22452150256900 = 5003891^2 + 4738370^2 .

It is a cyclic number.

It is not a de Polignac number, because 47491075396781 - 2¹⁸ = 47491075134637 is a prime.

It is a super-2 number, since 2×47491075396781² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47491075396981) 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, 23745537698390 + 23745537698391.

It is an arithmetic number, because the mean of its divisors is an integer number (23745537698391).

Almost surely, 2^{47491075396781} is an apocalyptic number.

It is an amenable number.

47491075396781 is a deficient number, since it is larger than the sum of its proper divisors (1).

47491075396781 is an equidigital number, since it uses as much as digits as its factorization.

47491075396781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320060160, while the sum is 71.

The spelling of 47491075396781 in words is "forty-seven trillion, four hundred ninety-one billion, seventy-five million, three hundred ninety-six thousand, seven hundred eighty-one".