812750905 has 4 divisors (see below), whose sum is σ = 975301092. Its totient is φ = 650200720.

The previous prime is 812750903. The next prime is 812750933. The reversal of 812750905 is 509057218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 509057218 = 2 ⋅254528609.

It can be written as a sum of positive squares in 2 ways, for example, as 350887824 + 461863081 = 18732^2 + 21491^2 .

It is not a de Polignac number, because 812750905 - 2¹ = 812750903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (812750903) 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 3 ways as a sum of consecutive naturals, for example, 81275086 + ... + 81275095.

It is an arithmetic number, because the mean of its divisors is an integer number (243825273).

Almost surely, 2^812750905 is an apocalyptic number.

It is an amenable number.

812750905 is a deficient number, since it is larger than the sum of its proper divisors (162550187).

812750905 is a wasteful number, since it uses less digits than its factorization.

812750905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162550186.

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 812750905 is about 28508.7864526009. The cubic root of 812750905 is about 933.2238311867.

The spelling of 812750905 in words is "eight hundred twelve million, seven hundred fifty thousand, nine hundred five".