812321047 has 8 divisors (see below), whose sum is σ = 860458896. Its totient is φ = 764222592.

The previous prime is 812321023. The next prime is 812321057. The reversal of 812321047 is 740123218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 812321047 - 2⁷ = 812320919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812321017) 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 7 ways as a sum of consecutive naturals, for example, 39808 + ... + 56650.

It is an arithmetic number, because the mean of its divisors is an integer number (107557362).

Almost surely, 2^812321047 is an apocalyptic number.

812321047 is a deficient number, since it is larger than the sum of its proper divisors (48137849).

812321047 is a wasteful number, since it uses less digits than its factorization.

812321047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19697.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 812321047 is about 28501.2464113414. The cubic root of 812321047 is about 933.0592770901.

The spelling of 812321047 in words is "eight hundred twelve million, three hundred twenty-one thousand, forty-seven".