812138145 has 64 divisors (see below), whose sum is σ = 1633443840. Its totient is φ = 335386368.

The previous prime is 812138143. The next prime is 812138149. The reversal of 812138145 is 541831218.

It is not a de Polignac number, because 812138145 - 2¹ = 812138143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (812138143) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 57826 + ... + 70484.

It is an arithmetic number, because the mean of its divisors is an integer number (25522560).

Almost surely, 2^812138145 is an apocalyptic number.

It is an amenable number.

812138145 is an abundant number, since it is smaller than the sum of its proper divisors (821305695).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

812138145 is a wasteful number, since it uses less digits than its factorization.

812138145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12734.

The product of its digits is 7680, while the sum is 33.

The square root of 812138145 is about 28498.0375640148. The cubic root of 812138145 is about 932.9892427039.

The spelling of 812138145 in words is "eight hundred twelve million, one hundred thirty-eight thousand, one hundred forty-five".