812347538721 has 8 divisors (see below), whose sum is σ = 1086826742400. Its totient is φ = 539716680432.

The previous prime is 812347538707. The next prime is 812347538753. The reversal of 812347538721 is 127835743218.

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

It is not a de Polignac number, because 812347538721 - 2⁶ = 812347538657 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (812347538791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 462085321 + ... + 462087078.

It is an arithmetic number, because the mean of its divisors is an integer number (135853342800).

Almost surely, 2^812347538721 is an apocalyptic number.

It is an amenable number.

812347538721 is a deficient number, since it is larger than the sum of its proper divisors (274479203679).

812347538721 is a wasteful number, since it uses less digits than its factorization.

812347538721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924172695.

The product of its digits is 2257920, while the sum is 51.

The spelling of 812347538721 in words is "eight hundred twelve billion, three hundred forty-seven million, five hundred thirty-eight thousand, seven hundred twenty-one".