828942217 has 2 divisors, whose sum is σ = 828942218. Its totient is φ = 828942216.

The previous prime is 828942211. The next prime is 828942221. The reversal of 828942217 is 712249828.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 645718921 + 183223296 = 25411^2 + 13536^2 .

It is a cyclic number.

It is not a de Polignac number, because 828942217 - 2³ = 828942209 is a prime.

It is not a weakly prime, because it can be changed into another prime (828942211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 414471108 + 414471109.

It is an arithmetic number, because the mean of its divisors is an integer number (414471109).

Almost surely, 2^828942217 is an apocalyptic number.

It is an amenable number.

828942217 is a deficient number, since it is larger than the sum of its proper divisors (1).

828942217 is an equidigital number, since it uses as much as digits as its factorization.

828942217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 43.

The square root of 828942217 is about 28791.3566370187. The cubic root of 828942217 is about 939.3802376871.

The spelling of 828942217 in words is "eight hundred twenty-eight million, nine hundred forty-two thousand, two hundred seventeen".