47171213 has 4 divisors (see below), whose sum is σ = 47817468. Its totient is φ = 46524960.

The previous prime is 47171207. The next prime is 47171231. The reversal of 47171213 is 31217174.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14760964 + 32410249 = 3842^2 + 5693^2 .

It is a cyclic number.

It is not a de Polignac number, because 47171213 - 2¹² = 47167117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47171233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 323018 + ... + 323163.

It is an arithmetic number, because the mean of its divisors is an integer number (11954367).

Almost surely, 2^47171213 is an apocalyptic number.

It is an amenable number.

47171213 is a deficient number, since it is larger than the sum of its proper divisors (646255).

47171213 is an equidigital number, since it uses as much as digits as its factorization.

47171213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646254.

The product of its digits is 1176, while the sum is 26.

The square root of 47171213 is about 6868.1302404657. The cubic root of 47171213 is about 361.3202882831.

Adding to 47171213 its reverse (31217174), we get a palindrome (78388387).

The spelling of 47171213 in words is "forty-seven million, one hundred seventy-one thousand, two hundred thirteen".