47651209 has 2 divisors, whose sum is σ = 47651210. Its totient is φ = 47651208.

The previous prime is 47651207. The next prime is 47651249. The reversal of 47651209 is 90215674.

47651209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47610000 + 41209 = 6900^2 + 203^2 .

It is a cyclic number.

It is not a de Polignac number, because 47651209 - 2¹ = 47651207 is a prime.

Together with 47651207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (47651207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23825604 + 23825605.

It is an arithmetic number, because the mean of its divisors is an integer number (23825605).

Almost surely, 2^47651209 is an apocalyptic number.

It is an amenable number.

47651209 is a deficient number, since it is larger than the sum of its proper divisors (1).

47651209 is an equidigital number, since it uses as much as digits as its factorization.

47651209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 47651209 is about 6902.9855135296. The cubic root of 47651209 is about 362.5417064975.

The spelling of 47651209 in words is "forty-seven million, six hundred fifty-one thousand, two hundred nine".