47897209 has 2 divisors, whose sum is σ = 47897210. Its totient is φ = 47897208.

The previous prime is 47897191. The next prime is 47897221. The reversal of 47897209 is 90279874.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44555625 + 3341584 = 6675^2 + 1828^2 .

It is a cyclic number.

It is not a de Polignac number, because 47897209 - 2⁹ = 47896697 is a prime.

It is not a weakly prime, because it can be changed into another prime (47897249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23948604 + 23948605.

It is an arithmetic number, because the mean of its divisors is an integer number (23948605).

Almost surely, 2^47897209 is an apocalyptic number.

It is an amenable number.

47897209 is a deficient number, since it is larger than the sum of its proper divisors (1).

47897209 is an equidigital number, since it uses as much as digits as its factorization.

47897209 is an evil number, because the sum of its binary digits is even.

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

The square root of 47897209 is about 6920.7809530428. The cubic root of 47897209 is about 363.1645114375.

The spelling of 47897209 in words is "forty-seven million, eight hundred ninety-seven thousand, two hundred nine".