812380609 has 4 divisors (see below), whose sum is σ = 812457904. Its totient is φ = 812303316.

The previous prime is 812380589. The next prime is 812380627. The reversal of 812380609 is 906083218.

812380609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 812380609 - 2⁵ = 812380577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (812380409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19827 + ... + 44920.

It is an arithmetic number, because the mean of its divisors is an integer number (203114476).

Almost surely, 2^812380609 is an apocalyptic number.

It is an amenable number.

812380609 is a deficient number, since it is larger than the sum of its proper divisors (77295).

812380609 is a wasteful number, since it uses less digits than its factorization.

812380609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77294.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 812380609 is about 28502.2912938592. The cubic root of 812380609 is about 933.0820815050.

The spelling of 812380609 in words is "eight hundred twelve million, three hundred eighty thousand, six hundred nine".