47409990721 has 2 divisors, whose sum is σ = 47409990722. Its totient is φ = 47409990720.

The previous prime is 47409990701. The next prime is 47409990751. The reversal of 47409990721 is 12709990474.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40929740721 + 6480250000 = 202311^2 + 80500^2 .

It is a cyclic number.

It is not a de Polignac number, because 47409990721 - 2¹¹ = 47409988673 is a prime.

It is not a weakly prime, because it can be changed into another prime (47409990701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23704995360 + 23704995361.

It is an arithmetic number, because the mean of its divisors is an integer number (23704995361).

Almost surely, 2^47409990721 is an apocalyptic number.

It is an amenable number.

47409990721 is a deficient number, since it is larger than the sum of its proper divisors (1).

47409990721 is an equidigital number, since it uses as much as digits as its factorization.

47409990721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1143072, while the sum is 52.

The spelling of 47409990721 in words is "forty-seven billion, four hundred nine million, nine hundred ninety thousand, seven hundred twenty-one".