405316217 has 2 divisors, whose sum is σ = 405316218. Its totient is φ = 405316216.

The previous prime is 405316183. The next prime is 405316231. The reversal of 405316217 is 712613504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 367910761 + 37405456 = 19181^2 + 6116^2 .

It is a cyclic number.

It is not a de Polignac number, because 405316217 - 2¹⁰ = 405315193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 405316217.

It is not a weakly prime, because it can be changed into another prime (405316117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202658108 + 202658109.

It is an arithmetic number, because the mean of its divisors is an integer number (202658109).

Almost surely, 2^405316217 is an apocalyptic number.

It is an amenable number.

405316217 is a deficient number, since it is larger than the sum of its proper divisors (1).

405316217 is an equidigital number, since it uses as much as digits as its factorization.

405316217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 405316217 is about 20132.4667390760. The cubic root of 405316217 is about 740.0561297818.

The spelling of 405316217 in words is "four hundred five million, three hundred sixteen thousand, two hundred seventeen".