428212171 has 2 divisors, whose sum is σ = 428212172. Its totient is φ = 428212170.

The previous prime is 428212163. The next prime is 428212243. The reversal of 428212171 is 171212824.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 428212171 - 2³ = 428212163 is a prime.

It is not a weakly prime, because it can be changed into another prime (428210171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214106085 + 214106086.

It is an arithmetic number, because the mean of its divisors is an integer number (214106086).

Almost surely, 2^428212171 is an apocalyptic number.

428212171 is a deficient number, since it is larger than the sum of its proper divisors (1).

428212171 is an equidigital number, since it uses as much as digits as its factorization.

428212171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1792, while the sum is 28.

The square root of 428212171 is about 20693.2880664239. The cubic root of 428212171 is about 753.7367123150.

Adding to 428212171 its reverse (171212824), we get a palindrome (599424995).

The spelling of 428212171 in words is "four hundred twenty-eight million, two hundred twelve thousand, one hundred seventy-one".