845323009 has 2 divisors, whose sum is σ = 845323010. Its totient is φ = 845323008.

The previous prime is 845323007. The next prime is 845323057. The reversal of 845323009 is 900323548.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 833592384 + 11730625 = 28872^2 + 3425^2 .

It is a cyclic number.

It is not a de Polignac number, because 845323009 - 2¹ = 845323007 is a prime.

Together with 845323007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (845323007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422661504 + 422661505.

It is an arithmetic number, because the mean of its divisors is an integer number (422661505).

Almost surely, 2^845323009 is an apocalyptic number.

It is an amenable number.

845323009 is a deficient number, since it is larger than the sum of its proper divisors (1).

845323009 is an equidigital number, since it uses as much as digits as its factorization.

845323009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 845323009 is about 29074.4391003507. The cubic root of 845323009 is about 945.5276427758.

The spelling of 845323009 in words is "eight hundred forty-five million, three hundred twenty-three thousand, nine".