47773291721 has 2 divisors, whose sum is σ = 47773291722. Its totient is φ = 47773291720.

The previous prime is 47773291663. The next prime is 47773291733. The reversal of 47773291721 is 12719237774.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46975794121 + 797497600 = 216739^2 + 28240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47773291721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 47773291721.

It is not a weakly prime, because it can be changed into another prime (47773291021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23886645860 + 23886645861.

It is an arithmetic number, because the mean of its divisors is an integer number (23886645861).

Almost surely, 2^47773291721 is an apocalyptic number.

It is an amenable number.

47773291721 is a deficient number, since it is larger than the sum of its proper divisors (1).

47773291721 is an equidigital number, since it uses as much as digits as its factorization.

47773291721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1037232, while the sum is 50.

The spelling of 47773291721 in words is "forty-seven billion, seven hundred seventy-three million, two hundred ninety-one thousand, seven hundred twenty-one".