47509213 has 2 divisors, whose sum is σ = 47509214. Its totient is φ = 47509212.

The previous prime is 47509199. The next prime is 47509223. The reversal of 47509213 is 31290574.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31843449 + 15665764 = 5643^2 + 3958^2 .

It is a cyclic number.

It is not a de Polignac number, because 47509213 - 2⁵ = 47509181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47509223) 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, 23754606 + 23754607.

It is an arithmetic number, because the mean of its divisors is an integer number (23754607).

Almost surely, 2^47509213 is an apocalyptic number.

It is an amenable number.

47509213 is a deficient number, since it is larger than the sum of its proper divisors (1).

47509213 is an equidigital number, since it uses as much as digits as its factorization.

47509213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 47509213 is about 6892.6927249080. The cubic root of 47509213 is about 362.1812351147.

Adding to 47509213 its reverse (31290574), we get a palindrome (78799787).

The spelling of 47509213 in words is "forty-seven million, five hundred nine thousand, two hundred thirteen".