47471395781 has 2 divisors, whose sum is σ = 47471395782. Its totient is φ = 47471395780.

The previous prime is 47471395771. The next prime is 47471395831. The reversal of 47471395781 is 18759317474.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47308425025 + 162970756 = 217505^2 + 12766^2 .

It is a cyclic number.

It is not a de Polignac number, because 47471395781 - 2¹⁸ = 47471133637 is a prime.

It is a super-2 number, since 2×47471395781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47471395771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23735697890 + 23735697891.

It is an arithmetic number, because the mean of its divisors is an integer number (23735697891).

Almost surely, 2^47471395781 is an apocalyptic number.

It is an amenable number.

47471395781 is a deficient number, since it is larger than the sum of its proper divisors (1).

47471395781 is an equidigital number, since it uses as much as digits as its factorization.

47471395781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5927040, while the sum is 56.

The spelling of 47471395781 in words is "forty-seven billion, four hundred seventy-one million, three hundred ninety-five thousand, seven hundred eighty-one".