845164609 has 2 divisors, whose sum is σ = 845164610. Its totient is φ = 845164608.

The previous prime is 845164591. The next prime is 845164627. The reversal of 845164609 is 906461548.

It is a balanced prime because it is at equal distance from previous prime (845164591) and next prime (845164627).

It can be written as a sum of positive squares in only one way, i.e., 695640625 + 149523984 = 26375^2 + 12228^2 .

It is a cyclic number.

It is not a de Polignac number, because 845164609 - 2²¹ = 843067457 is a prime.

It is a super-2 number, since 2×845164609² = 1428606432612245762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (845164679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422582304 + 422582305.

It is an arithmetic number, because the mean of its divisors is an integer number (422582305).

Almost surely, 2^845164609 is an apocalyptic number.

It is an amenable number.

845164609 is a deficient number, since it is larger than the sum of its proper divisors (1).

845164609 is an equidigital number, since it uses as much as digits as its factorization.

845164609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 845164609 is about 29071.7149304956. The cubic root of 845164609 is about 945.4685801717.

The spelling of 845164609 in words is "eight hundred forty-five million, one hundred sixty-four thousand, six hundred nine".