47946221 has 2 divisors, whose sum is σ = 47946222. Its totient is φ = 47946220.

The previous prime is 47946211. The next prime is 47946233. The reversal of 47946221 is 12264974.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46648900 + 1297321 = 6830^2 + 1139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47946221 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47946211) 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, 23973110 + 23973111.

It is an arithmetic number, because the mean of its divisors is an integer number (23973111).

Almost surely, 2^47946221 is an apocalyptic number.

It is an amenable number.

47946221 is a deficient number, since it is larger than the sum of its proper divisors (1).

47946221 is an equidigital number, since it uses as much as digits as its factorization.

47946221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 35.

The square root of 47946221 is about 6924.3209775400. The cubic root of 47946221 is about 363.2883415564.

The spelling of 47946221 in words is "forty-seven million, nine hundred forty-six thousand, two hundred twenty-one".