40317509 has 2 divisors, whose sum is σ = 40317510. Its totient is φ = 40317508.

The previous prime is 40317503. The next prime is 40317517. The reversal of 40317509 is 90571304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26553409 + 13764100 = 5153^2 + 3710^2 .

It is a cyclic number.

It is not a de Polignac number, because 40317509 - 2⁸ = 40317253 is a prime.

It is equal to p_2451818 and since 40317509 and 2451818 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40317503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20158754 + 20158755.

It is an arithmetic number, because the mean of its divisors is an integer number (20158755).

Almost surely, 2^40317509 is an apocalyptic number.

It is an amenable number.

40317509 is a deficient number, since it is larger than the sum of its proper divisors (1).

40317509 is an equidigital number, since it uses as much as digits as its factorization.

40317509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 40317509 is about 6349.6069957124. The cubic root of 40317509 is about 342.8976935090.

The spelling of 40317509 in words is "forty million, three hundred seventeen thousand, five hundred nine".