47217813 has 4 divisors (see below), whose sum is σ = 62957088. Its totient is φ = 31478540.

The previous prime is 47217811. The next prime is 47217817. The reversal of 47217813 is 31871274.

It is a happy number.

47217813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 47217813 - 2¹ = 47217811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47217811) 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 in 3 ways as a sum of consecutive naturals, for example, 7869633 + ... + 7869638.

It is an arithmetic number, because the mean of its divisors is an integer number (15739272).

Almost surely, 2^47217813 is an apocalyptic number.

It is an amenable number.

47217813 is a deficient number, since it is larger than the sum of its proper divisors (15739275).

47217813 is a wasteful number, since it uses less digits than its factorization.

47217813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15739274.

The product of its digits is 9408, while the sum is 33.

The square root of 47217813 is about 6871.5218838333. The cubic root of 47217813 is about 361.4392307685.

The spelling of 47217813 in words is "forty-seven million, two hundred seventeen thousand, eight hundred thirteen".