47238418781 has 2 divisors, whose sum is σ = 47238418782. Its totient is φ = 47238418780.

The previous prime is 47238418763. The next prime is 47238418793. The reversal of 47238418781 is 18781483274.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39309406756 + 7929012025 = 198266^2 + 89045^2 .

It is a cyclic number.

It is not a de Polignac number, because 47238418781 - 2¹⁰ = 47238417757 is a prime.

It is a super-2 number, since 2×47238418781² (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 (47238018781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23619209390 + 23619209391.

It is an arithmetic number, because the mean of its divisors is an integer number (23619209391).

Almost surely, 2^47238418781 is an apocalyptic number.

It is an amenable number.

47238418781 is a deficient number, since it is larger than the sum of its proper divisors (1).

47238418781 is an equidigital number, since it uses as much as digits as its factorization.

47238418781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2408448, while the sum is 53.

The spelling of 47238418781 in words is "forty-seven billion, two hundred thirty-eight million, four hundred eighteen thousand, seven hundred eighty-one".