827198161 has 2 divisors, whose sum is σ = 827198162. Its totient is φ = 827198160.

The previous prime is 827198153. The next prime is 827198179. The reversal of 827198161 is 161891728.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 532732561 + 294465600 = 23081^2 + 17160^2 .

It is a cyclic number.

It is not a de Polignac number, because 827198161 - 2³ = 827198153 is a prime.

It is not a weakly prime, because it can be changed into another prime (827193161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 413599080 + 413599081.

It is an arithmetic number, because the mean of its divisors is an integer number (413599081).

Almost surely, 2^827198161 is an apocalyptic number.

It is an amenable number.

827198161 is a deficient number, since it is larger than the sum of its proper divisors (1).

827198161 is an equidigital number, since it uses as much as digits as its factorization.

827198161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 43.

The square root of 827198161 is about 28761.0528492960. The cubic root of 827198161 is about 938.7209709564.

The spelling of 827198161 in words is "eight hundred twenty-seven million, one hundred ninety-eight thousand, one hundred sixty-one".