43940161 has 2 divisors, whose sum is σ = 43940162. Its totient is φ = 43940160.

The previous prime is 43940153. The next prime is 43940167. The reversal of 43940161 is 16104934.

43940161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42771600 + 1168561 = 6540^2 + 1081^2 .

It is a cyclic number.

It is not a de Polignac number, because 43940161 - 2³ = 43940153 is a prime.

It is not a weakly prime, because it can be changed into another prime (43940167) 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, 21970080 + 21970081.

It is an arithmetic number, because the mean of its divisors is an integer number (21970081).

Almost surely, 2^43940161 is an apocalyptic number.

It is an amenable number.

43940161 is a deficient number, since it is larger than the sum of its proper divisors (1).

43940161 is an equidigital number, since it uses as much as digits as its factorization.

43940161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 43940161 is about 6628.7375117740. The cubic root of 43940161 is about 352.8747211442.

The spelling of 43940161 in words is "forty-three million, nine hundred forty thousand, one hundred sixty-one".