819156161 has 2 divisors, whose sum is σ = 819156162. Its totient is φ = 819156160.

The previous prime is 819156131. The next prime is 819156193. The reversal of 819156161 is 161651918.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 796650625 + 22505536 = 28225^2 + 4744^2 .

It is a cyclic number.

It is not a de Polignac number, because 819156161 - 2¹⁴ = 819139777 is a prime.

It is a super-2 number, since 2×819156161² = 1342033632208515842, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (819156131) 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, 409578080 + 409578081.

It is an arithmetic number, because the mean of its divisors is an integer number (409578081).

Almost surely, 2^819156161 is an apocalyptic number.

It is an amenable number.

819156161 is a deficient number, since it is larger than the sum of its proper divisors (1).

819156161 is an equidigital number, since it uses as much as digits as its factorization.

819156161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 38.

The square root of 819156161 is about 28620.9042659382. The cubic root of 819156161 is about 935.6689850432.

The spelling of 819156161 in words is "eight hundred nineteen million, one hundred fifty-six thousand, one hundred sixty-one".