47204509 has 4 divisors (see below), whose sum is σ = 51495840. Its totient is φ = 42913180.

The previous prime is 47204477. The next prime is 47204561. The reversal of 47204509 is 90540274.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 47204509 - 2⁵ = 47204477 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47201509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2145649 + ... + 2145670.

It is an arithmetic number, because the mean of its divisors is an integer number (12873960).

Almost surely, 2^47204509 is an apocalyptic number.

It is an amenable number.

47204509 is a deficient number, since it is larger than the sum of its proper divisors (4291331).

47204509 is a wasteful number, since it uses less digits than its factorization.

47204509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4291330.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 47204509 is about 6870.5537622524. The cubic root of 47204509 is about 361.4052814394.

It can be divided in two parts, 4720 and 4509, that added together give a palindrome (9229).

The spelling of 47204509 in words is "forty-seven million, two hundred four thousand, five hundred nine".