47636221 has 2 divisors, whose sum is σ = 47636222. Its totient is φ = 47636220.

The previous prime is 47636213. The next prime is 47636231. The reversal of 47636221 is 12263674.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26152996 + 21483225 = 5114^2 + 4635^2 .

It is a cyclic number.

It is not a de Polignac number, because 47636221 - 2³ = 47636213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47636201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23818110 + 23818111.

It is an arithmetic number, because the mean of its divisors is an integer number (23818111).

Almost surely, 2^47636221 is an apocalyptic number.

It is an amenable number.

47636221 is a deficient number, since it is larger than the sum of its proper divisors (1).

47636221 is an equidigital number, since it uses as much as digits as its factorization.

47636221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 31.

The square root of 47636221 is about 6901.8998109216. The cubic root of 47636221 is about 362.5036917579.

Adding to 47636221 its reverse (12263674), we get a palindrome (59899895).

The spelling of 47636221 in words is "forty-seven million, six hundred thirty-six thousand, two hundred twenty-one".