47841721 has 2 divisors, whose sum is σ = 47841722. Its totient is φ = 47841720.

The previous prime is 47841719. The next prime is 47841727. The reversal of 47841721 is 12714874.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38007225 + 9834496 = 6165^2 + 3136^2 .

It is a cyclic number.

It is not a de Polignac number, because 47841721 - 2¹ = 47841719 is a prime.

Together with 47841719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (47841727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23920860 + 23920861.

It is an arithmetic number, because the mean of its divisors is an integer number (23920861).

Almost surely, 2^47841721 is an apocalyptic number.

It is an amenable number.

47841721 is a deficient number, since it is larger than the sum of its proper divisors (1).

47841721 is an equidigital number, since it uses as much as digits as its factorization.

47841721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12544, while the sum is 34.

The square root of 47841721 is about 6916.7709951971. The cubic root of 47841721 is about 363.0242175355.

The spelling of 47841721 in words is "forty-seven million, eight hundred forty-one thousand, seven hundred twenty-one".