47138994521 has 2 divisors, whose sum is σ = 47138994522. Its totient is φ = 47138994520.

The previous prime is 47138994499. The next prime is 47138994589. The reversal of 47138994521 is 12549983174.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29725552921 + 17413441600 = 172411^2 + 131960^2 .

It is a cyclic number.

It is not a de Polignac number, because 47138994521 - 2²⁶ = 47071885657 is a prime.

It is not a weakly prime, because it can be changed into another prime (47138994121) 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, 23569497260 + 23569497261.

It is an arithmetic number, because the mean of its divisors is an integer number (23569497261).

Almost surely, 2^47138994521 is an apocalyptic number.

It is an amenable number.

47138994521 is a deficient number, since it is larger than the sum of its proper divisors (1).

47138994521 is an equidigital number, since it uses as much as digits as its factorization.

47138994521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2177280, while the sum is 53.

The spelling of 47138994521 in words is "forty-seven billion, one hundred thirty-eight million, nine hundred ninety-four thousand, five hundred twenty-one".