47808121 has 2 divisors, whose sum is σ = 47808122. Its totient is φ = 47808120.

The previous prime is 47808119. The next prime is 47808133. The reversal of 47808121 is 12180874.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35283600 + 12524521 = 5940^2 + 3539^2 .

It is a cyclic number.

It is not a de Polignac number, because 47808121 - 2¹ = 47808119 is a prime.

Together with 47808119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (47808151) 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, 23904060 + 23904061.

It is an arithmetic number, because the mean of its divisors is an integer number (23904061).

Almost surely, 2^47808121 is an apocalyptic number.

It is an amenable number.

47808121 is a deficient number, since it is larger than the sum of its proper divisors (1).

47808121 is an equidigital number, since it uses as much as digits as its factorization.

47808121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 47808121 is about 6914.3416895609. The cubic root of 47808121 is about 362.9392117421.

Adding to 47808121 its reverse (12180874), we get a palindrome (59988995).

The spelling of 47808121 in words is "forty-seven million, eight hundred eight thousand, one hundred twenty-one".