845309 has 2 divisors, whose sum is σ = 845310. Its totient is φ = 845308.

The previous prime is 845303. The next prime is 845333. The reversal of 845309 is 903548.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 511225 + 334084 = 715^2 + 578^2 .

It is a cyclic number.

It is not a de Polignac number, because 845309 - 2¹² = 841213 is a prime.

It is a Chen prime.

It is a plaindrome in base 13.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (845303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422654 + 422655.

It is an arithmetic number, because the mean of its divisors is an integer number (422655).

2⁸⁴⁵³⁰⁹ is an apocalyptic number.

It is an amenable number.

845309 is a deficient number, since it is larger than the sum of its proper divisors (1).

845309 is an equidigital number, since it uses as much as digits as its factorization.

845309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 845309 is about 919.4068740226. The cubic root of 845309 is about 94.5522419538.

The spelling of 845309 in words is "eight hundred forty-five thousand, three hundred nine".