47287909 has 2 divisors, whose sum is σ = 47287910. Its totient is φ = 47287908.

The previous prime is 47287907. The next prime is 47287937. The reversal of 47287909 is 90978274.

47287909 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., 46539684 + 748225 = 6822^2 + 865^2 .

It is a cyclic number.

It is not a de Polignac number, because 47287909 - 2¹ = 47287907 is a prime.

It is a super-2 number, since 2×47287909² = 4472292675184562, which contains 22 as substring.

Together with 47287907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47287907) 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, 23643954 + 23643955.

It is an arithmetic number, because the mean of its divisors is an integer number (23643955).

Almost surely, 2^47287909 is an apocalyptic number.

It is an amenable number.

47287909 is a deficient number, since it is larger than the sum of its proper divisors (1).

47287909 is an equidigital number, since it uses as much as digits as its factorization.

47287909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 47287909 is about 6876.6204635708. The cubic root of 47287909 is about 361.6179974670.

The spelling of 47287909 in words is "forty-seven million, two hundred eighty-seven thousand, nine hundred nine".