863171971 has 2 divisors, whose sum is σ = 863171972. Its totient is φ = 863171970.

The previous prime is 863171887. The next prime is 863171987. The reversal of 863171971 is 179171368.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 863171971 - 2¹³ = 863163779 is a prime.

It is not a weakly prime, because it can be changed into another prime (863178971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431585985 + 431585986.

It is an arithmetic number, because the mean of its divisors is an integer number (431585986).

Almost surely, 2^863171971 is an apocalyptic number.

863171971 is a deficient number, since it is larger than the sum of its proper divisors (1).

863171971 is an equidigital number, since it uses as much as digits as its factorization.

863171971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 43.

The square root of 863171971 is about 29379.7884777954. The cubic root of 863171971 is about 952.1362714063.

It can be divided in two parts, 86317 and 1971, that added together give a palindrome (88288).

The spelling of 863171971 in words is "eight hundred sixty-three million, one hundred seventy-one thousand, nine hundred seventy-one".