845670509 has 12 divisors (see below), whose sum is σ = 890053500. Its totient is φ = 803398464.

The previous prime is 845670499. The next prime is 845670523. The reversal of 845670509 is 905076548.

It can be written as a sum of positive squares in 2 ways, for example, as 347934409 + 497736100 = 18653^2 + 22310^2 .

It is not a de Polignac number, because 845670509 - 2⁴ = 845670493 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 845670509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (845660509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73457 + ... + 84185.

It is an arithmetic number, because the mean of its divisors is an integer number (74171125).

Almost surely, 2^845670509 is an apocalyptic number.

It is an amenable number.

845670509 is a deficient number, since it is larger than the sum of its proper divisors (44382991).

845670509 is a wasteful number, since it uses less digits than its factorization.

845670509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10924 (or 10901 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 44.

The square root of 845670509 is about 29080.4145259314. The cubic root of 845670509 is about 945.6571892486.

The spelling of 845670509 in words is "eight hundred forty-five million, six hundred seventy thousand, five hundred nine".