812716691 has 2 divisors, whose sum is σ = 812716692. Its totient is φ = 812716690.

The previous prime is 812716657. The next prime is 812716693. The reversal of 812716691 is 196617218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 812716691 - 2⁶ = 812716627 is a prime.

Together with 812716693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (812716693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406358345 + 406358346.

It is an arithmetic number, because the mean of its divisors is an integer number (406358346).

Almost surely, 2^812716691 is an apocalyptic number.

812716691 is a deficient number, since it is larger than the sum of its proper divisors (1).

812716691 is an equidigital number, since it uses as much as digits as its factorization.

812716691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 41.

The square root of 812716691 is about 28508.1863856682. The cubic root of 812716691 is about 933.2107358386.

The spelling of 812716691 in words is "eight hundred twelve million, seven hundred sixteen thousand, six hundred ninety-one".