471821 has 6 divisors (see below), whose sum is σ = 548910. Its totient is φ = 404376.

The previous prime is 471817. The next prime is 471841. The reversal of 471821 is 128174.

It can be written as a sum of positive squares in only one way, i.e., 470596 + 1225 = 686^2 + 35^2 .

It is not a de Polignac number, because 471821 - 2² = 471817 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 471821.

It is not an unprimeable number, because it can be changed into a prime (471841) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4766 + ... + 4863.

It is an arithmetic number, because the mean of its divisors is an integer number (91485).

2⁴⁷¹⁸²¹ is an apocalyptic number.

It is an amenable number.

471821 is a deficient number, since it is larger than the sum of its proper divisors (77089).

471821 is an equidigital number, since it uses as much as digits as its factorization.

471821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9643 (or 9636 counting only the distinct ones).

The product of its digits is 448, while the sum is 23.

The square root of 471821 is about 686.8922768528. The cubic root of 471821 is about 77.8500846103.

Adding to 471821 its reverse (128174), we get a palindrome (599995).

The spelling of 471821 in words is "four hundred seventy-one thousand, eight hundred twenty-one".