471996821 has 2 divisors, whose sum is σ = 471996822. Its totient is φ = 471996820.

The previous prime is 471996817. The next prime is 471996829. The reversal of 471996821 is 128699174.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 458388100 + 13608721 = 21410^2 + 3689^2 .

It is a cyclic number.

It is not a de Polignac number, because 471996821 - 2² = 471996817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (471996829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 235998410 + 235998411.

It is an arithmetic number, because the mean of its divisors is an integer number (235998411).

Almost surely, 2^471996821 is an apocalyptic number.

It is an amenable number.

471996821 is a deficient number, since it is larger than the sum of its proper divisors (1).

471996821 is an equidigital number, since it uses as much as digits as its factorization.

471996821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 47.

The square root of 471996821 is about 21725.4878196095. The cubic root of 471996821 is about 778.5975351713.

The spelling of 471996821 in words is "four hundred seventy-one million, nine hundred ninety-six thousand, eight hundred twenty-one".