825647161 has 2 divisors, whose sum is σ = 825647162. Its totient is φ = 825647160.

The previous prime is 825647153. The next prime is 825647191. The reversal of 825647161 is 161746528.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 644906025 + 180741136 = 25395^2 + 13444^2 .

It is a cyclic number.

It is not a de Polignac number, because 825647161 - 2³ = 825647153 is a prime.

It is not a weakly prime, because it can be changed into another prime (825647111) 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, 412823580 + 412823581.

It is an arithmetic number, because the mean of its divisors is an integer number (412823581).

Almost surely, 2^825647161 is an apocalyptic number.

It is an amenable number.

825647161 is a deficient number, since it is larger than the sum of its proper divisors (1).

825647161 is an equidigital number, since it uses as much as digits as its factorization.

825647161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 40.

The square root of 825647161 is about 28734.0766512516. The cubic root of 825647161 is about 938.1339019733.

The spelling of 825647161 in words is "eight hundred twenty-five million, six hundred forty-seven thousand, one hundred sixty-one".