811365977 has 2 divisors, whose sum is σ = 811365978. Its totient is φ = 811365976.

The previous prime is 811365943. The next prime is 811365979. The reversal of 811365977 is 779563118.

811365977 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 526060096 + 285305881 = 22936^2 + 16891^2 .

It is a cyclic number.

It is not a de Polignac number, because 811365977 - 2¹⁸ = 811103833 is a prime.

Together with 811365979, 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 (811365979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405682988 + 405682989.

It is an arithmetic number, because the mean of its divisors is an integer number (405682989).

Almost surely, 2^811365977 is an apocalyptic number.

It is an amenable number.

811365977 is a deficient number, since it is larger than the sum of its proper divisors (1).

811365977 is an equidigital number, since it uses as much as digits as its factorization.

811365977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 47.

The square root of 811365977 is about 28484.4866023595. The cubic root of 811365977 is about 932.6934585094.

The spelling of 811365977 in words is "eight hundred eleven million, three hundred sixty-five thousand, nine hundred seventy-seven".