40313561 has 2 divisors, whose sum is σ = 40313562. Its totient is φ = 40313560.

The previous prime is 40313557. The next prime is 40313591. The reversal of 40313561 is 16531304.

It is a happy number.

40313561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31990336 + 8323225 = 5656^2 + 2885^2 .

It is a cyclic number.

It is not a de Polignac number, because 40313561 - 2² = 40313557 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (40313501) 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, 20156780 + 20156781.

It is an arithmetic number, because the mean of its divisors is an integer number (20156781).

Almost surely, 2^40313561 is an apocalyptic number.

It is an amenable number.

40313561 is a deficient number, since it is larger than the sum of its proper divisors (1).

40313561 is an equidigital number, since it uses as much as digits as its factorization.

40313561 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 23.

The square root of 40313561 is about 6349.2961027188. The cubic root of 40313561 is about 342.8865006524.

Adding to 40313561 its reverse (16531304), we get a palindrome (56844865).

The spelling of 40313561 in words is "forty million, three hundred thirteen thousand, five hundred sixty-one".