440168161 has 2 divisors, whose sum is σ = 440168162. Its totient is φ = 440168160.

The previous prime is 440168159. The next prime is 440168189. The reversal of 440168161 is 161861044.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 351337536 + 88830625 = 18744^2 + 9425^2 .

It is a cyclic number.

It is not a de Polignac number, because 440168161 - 2¹ = 440168159 is a prime.

Together with 440168159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (440166161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220084080 + 220084081.

It is an arithmetic number, because the mean of its divisors is an integer number (220084081).

Almost surely, 2^440168161 is an apocalyptic number.

It is an amenable number.

440168161 is a deficient number, since it is larger than the sum of its proper divisors (1).

440168161 is an equidigital number, since it uses as much as digits as its factorization.

440168161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 440168161 is about 20980.1849610531. The cubic root of 440168161 is about 760.6873750062.

The spelling of 440168161 in words is "four hundred forty million, one hundred sixty-eight thousand, one hundred sixty-one".