40165901 has 2 divisors, whose sum is σ = 40165902. Its totient is φ = 40165900.

The previous prime is 40165861. The next prime is 40165903. The reversal of 40165901 is 10956104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21252100 + 18913801 = 4610^2 + 4349^2 .

It is a cyclic number.

It is not a de Polignac number, because 40165901 - 2²² = 35971597 is a prime.

It is a super-2 number, since 2×40165901² = 3226599206283602, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 40165903, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40165903) 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, 20082950 + 20082951.

It is an arithmetic number, because the mean of its divisors is an integer number (20082951).

Almost surely, 2^40165901 is an apocalyptic number.

It is an amenable number.

40165901 is a deficient number, since it is larger than the sum of its proper divisors (1).

40165901 is an equidigital number, since it uses as much as digits as its factorization.

40165901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 40165901 is about 6337.6573747718. The cubic root of 40165901 is about 342.4673483711.

The spelling of 40165901 in words is "forty million, one hundred sixty-five thousand, nine hundred one".