405317509 has 2 divisors, whose sum is σ = 405317510. Its totient is φ = 405317508.

The previous prime is 405317501. The next prime is 405317531. The reversal of 405317509 is 905713504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 284866884 + 120450625 = 16878^2 + 10975^2 .

It is a cyclic number.

It is not a de Polignac number, because 405317509 - 2³ = 405317501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405317501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202658754 + 202658755.

It is an arithmetic number, because the mean of its divisors is an integer number (202658755).

Almost surely, 2^405317509 is an apocalyptic number.

It is an amenable number.

405317509 is a deficient number, since it is larger than the sum of its proper divisors (1).

405317509 is an equidigital number, since it uses as much as digits as its factorization.

405317509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 405317509 is about 20132.4988265242. The cubic root of 405317509 is about 740.0569161238.

The spelling of 405317509 in words is "four hundred five million, three hundred seventeen thousand, five hundred nine".