812314681 has 2 divisors, whose sum is σ = 812314682. Its totient is φ = 812314680.

The previous prime is 812314663. The next prime is 812314691. The reversal of 812314681 is 186413218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 811737081 + 577600 = 28491^2 + 760^2 .

It is a cyclic number.

It is not a de Polignac number, because 812314681 - 2⁵ = 812314649 is a prime.

It is a super-2 number, since 2×812314681² = 1319710281936263522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (812314691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406157340 + 406157341.

It is an arithmetic number, because the mean of its divisors is an integer number (406157341).

Almost surely, 2^812314681 is an apocalyptic number.

It is an amenable number.

812314681 is a deficient number, since it is larger than the sum of its proper divisors (1).

812314681 is an equidigital number, since it uses as much as digits as its factorization.

812314681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 34.

The square root of 812314681 is about 28501.1347317962. The cubic root of 812314681 is about 933.0568396832.

Adding to 812314681 its reverse (186413218), we get a palindrome (998727899).

The spelling of 812314681 in words is "eight hundred twelve million, three hundred fourteen thousand, six hundred eighty-one".