864810977 has 2 divisors, whose sum is σ = 864810978. Its totient is φ = 864810976.

The previous prime is 864810931. The next prime is 864810979. The reversal of 864810977 is 779018468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 479434816 + 385376161 = 21896^2 + 19631^2 .

It is a cyclic number.

It is not a de Polignac number, because 864810977 - 2⁸ = 864810721 is a prime.

Together with 864810979, 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 (864810979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432405488 + 432405489.

It is an arithmetic number, because the mean of its divisors is an integer number (432405489).

Almost surely, 2^864810977 is an apocalyptic number.

It is an amenable number.

864810977 is a deficient number, since it is larger than the sum of its proper divisors (1).

864810977 is an equidigital number, since it uses as much as digits as its factorization.

864810977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 677376, while the sum is 50.

The square root of 864810977 is about 29407.6686767244. The cubic root of 864810977 is about 952.7385346930.

The spelling of 864810977 in words is "eight hundred sixty-four million, eight hundred ten thousand, nine hundred seventy-seven".