812726647 has 2 divisors, whose sum is σ = 812726648. Its totient is φ = 812726646.

The previous prime is 812726581. The next prime is 812726657. The reversal of 812726647 is 746627218.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-812726647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812726657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406363323 + 406363324.

It is an arithmetic number, because the mean of its divisors is an integer number (406363324).

Almost surely, 2^812726647 is an apocalyptic number.

812726647 is a deficient number, since it is larger than the sum of its proper divisors (1).

812726647 is an equidigital number, since it uses as much as digits as its factorization.

812726647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 43.

The square root of 812726647 is about 28508.3610016430. The cubic root of 812726647 is about 933.2145465179.

The spelling of 812726647 in words is "eight hundred twelve million, seven hundred twenty-six thousand, six hundred forty-seven".