47561209 has 2 divisors, whose sum is σ = 47561210. Its totient is φ = 47561208.

The previous prime is 47561207. The next prime is 47561219. The reversal of 47561209 is 90216574.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45265984 + 2295225 = 6728^2 + 1515^2 .

It is a cyclic number.

It is not a de Polignac number, because 47561209 - 2¹ = 47561207 is a prime.

Together with 47561207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (47561201) 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, 23780604 + 23780605.

It is an arithmetic number, because the mean of its divisors is an integer number (23780605).

Almost surely, 2^47561209 is an apocalyptic number.

It is an amenable number.

47561209 is a deficient number, since it is larger than the sum of its proper divisors (1).

47561209 is an equidigital number, since it uses as much as digits as its factorization.

47561209 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 47561209 is about 6896.4635140048. The cubic root of 47561209 is about 362.3133155284.

The spelling of 47561209 in words is "forty-seven million, five hundred sixty-one thousand, two hundred nine".