805518145 has 4 divisors (see below), whose sum is σ = 966621780. Its totient is φ = 644414512.

The previous prime is 805518143. The next prime is 805518169. The reversal of 805518145 is 541815508.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 199176769 + 606341376 = 14113^2 + 24624^2 .

It is a cyclic number.

It is not a de Polignac number, because 805518145 - 2¹ = 805518143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (805518143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80551810 + ... + 80551819.

It is an arithmetic number, because the mean of its divisors is an integer number (241655445).

Almost surely, 2^805518145 is an apocalyptic number.

It is an amenable number.

805518145 is a deficient number, since it is larger than the sum of its proper divisors (161103635).

805518145 is a wasteful number, since it uses less digits than its factorization.

805518145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161103634.

The product of its (nonzero) digits is 32000, while the sum is 37.

The square root of 805518145 is about 28381.6515551861. The cubic root of 805518145 is about 930.4472912925.

The spelling of 805518145 in words is "eight hundred five million, five hundred eighteen thousand, one hundred forty-five".