40645331 has 2 divisors, whose sum is σ = 40645332. Its totient is φ = 40645330.

The previous prime is 40645307. The next prime is 40645343. The reversal of 40645331 is 13354604.

40645331 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40645331 is a prime.

It is a super-2 number, since 2×40645331² = 3304085864199122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40645331.

It is not a weakly prime, because it can be changed into another prime (40645361) 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, 20322665 + 20322666.

It is an arithmetic number, because the mean of its divisors is an integer number (20322666).

Almost surely, 2^40645331 is an apocalyptic number.

40645331 is a deficient number, since it is larger than the sum of its proper divisors (1).

40645331 is an equidigital number, since it uses as much as digits as its factorization.

40645331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 40645331 is about 6375.3690873549. The cubic root of 40645331 is about 343.8245539229.

Adding to 40645331 its reverse (13354604), we get a palindrome (53999935).

The spelling of 40645331 in words is "forty million, six hundred forty-five thousand, three hundred thirty-one".