40491317 has 2 divisors, whose sum is σ = 40491318. Its totient is φ = 40491316.

The previous prime is 40491289. The next prime is 40491343. The reversal of 40491317 is 71319404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39828721 + 662596 = 6311^2 + 814^2 .

It is a cyclic number.

It is not a de Polignac number, because 40491317 - 2¹² = 40487221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40491317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40491377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20245658 + 20245659.

It is an arithmetic number, because the mean of its divisors is an integer number (20245659).

Almost surely, 2^40491317 is an apocalyptic number.

It is an amenable number.

40491317 is a deficient number, since it is larger than the sum of its proper divisors (1).

40491317 is an equidigital number, since it uses as much as digits as its factorization.

40491317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 40491317 is about 6363.2787932009. The cubic root of 40491317 is about 343.3897289038.

The spelling of 40491317 in words is "forty million, four hundred ninety-one thousand, three hundred seventeen".