811909845 has 16 divisors (see below), whose sum is σ = 1443395520. Its totient is φ = 433018512.

The previous prime is 811909837. The next prime is 811909873. The reversal of 811909845 is 548909118.

It is not a de Polignac number, because 811909845 - 2³ = 811909837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 811909845.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3006939 + ... + 3007208.

It is an arithmetic number, because the mean of its divisors is an integer number (90212220).

Almost surely, 2^811909845 is an apocalyptic number.

It is an amenable number.

811909845 is a deficient number, since it is larger than the sum of its proper divisors (631485675).

811909845 is a wasteful number, since it uses less digits than its factorization.

811909845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6014161 (or 6014155 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The square root of 811909845 is about 28494.0317435073. The cubic root of 811909845 is about 932.9018103676.

The spelling of 811909845 in words is "eight hundred eleven million, nine hundred nine thousand, eight hundred forty-five".