404000161 has 2 divisors, whose sum is σ = 404000162. Its totient is φ = 404000160.

The previous prime is 404000159. The next prime is 404000171. The reversal of 404000161 is 161000404.

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., 261436561 + 142563600 = 16169^2 + 11940^2 .

It is a cyclic number.

It is not a de Polignac number, because 404000161 - 2¹ = 404000159 is a prime.

It is a super-2 number, since 2×404000161² = 326432260176051842, which contains 22 as substring.

Together with 404000159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (404000111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202000080 + 202000081.

It is an arithmetic number, because the mean of its divisors is an integer number (202000081).

Almost surely, 2^404000161 is an apocalyptic number.

It is an amenable number.

404000161 is a deficient number, since it is larger than the sum of its proper divisors (1).

404000161 is an equidigital number, since it uses as much as digits as its factorization.

404000161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 404000161 is about 20099.7552472661. The cubic root of 404000161 is about 739.2542773726.

Adding to 404000161 its reverse (161000404), we get a palindrome (565000565).

The spelling of 404000161 in words is "four hundred four million, one hundred sixty-one", and thus it is an aban number.