40382161 has 2 divisors, whose sum is σ = 40382162. Its totient is φ = 40382160.

The previous prime is 40382159. The next prime is 40382197. The reversal of 40382161 is 16128304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26832400 + 13549761 = 5180^2 + 3681^2 .

It is a cyclic number.

It is not a de Polignac number, because 40382161 - 2¹ = 40382159 is a prime.

Together with 40382159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40385161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20191080 + 20191081.

It is an arithmetic number, because the mean of its divisors is an integer number (20191081).

Almost surely, 2^40382161 is an apocalyptic number.

It is an amenable number.

40382161 is a deficient number, since it is larger than the sum of its proper divisors (1).

40382161 is an equidigital number, since it uses as much as digits as its factorization.

40382161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 40382161 is about 6354.6959801394. The cubic root of 40382161 is about 343.0808825908.

The spelling of 40382161 in words is "forty million, three hundred eighty-two thousand, one hundred sixty-one".