40128161 has 2 divisors, whose sum is σ = 40128162. Its totient is φ = 40128160.

The previous prime is 40128157. The next prime is 40128197. The reversal of 40128161 is 16182104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39942400 + 185761 = 6320^2 + 431^2 .

It is a cyclic number.

It is not a de Polignac number, because 40128161 - 2² = 40128157 is a prime.

It is a super-2 number, since 2×40128161² = 3220538610483842, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40128131) 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, 20064080 + 20064081.

It is an arithmetic number, because the mean of its divisors is an integer number (20064081).

Almost surely, 2^40128161 is an apocalyptic number.

It is an amenable number.

40128161 is a deficient number, since it is larger than the sum of its proper divisors (1).

40128161 is an equidigital number, since it uses as much as digits as its factorization.

40128161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 40128161 is about 6334.6792341838. The cubic root of 40128161 is about 342.3600536464.

The spelling of 40128161 in words is "forty million, one hundred twenty-eight thousand, one hundred sixty-one".