63171971 has 2 divisors, whose sum is σ = 63171972. Its totient is φ = 63171970.

The previous prime is 63171943. The next prime is 63171973. The reversal of 63171971 is 17917136.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63171971 - 2¹⁸ = 62909827 is a prime.

Together with 63171973, 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 (63171973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31585985 + 31585986.

It is an arithmetic number, because the mean of its divisors is an integer number (31585986).

Almost surely, 2^63171971 is an apocalyptic number.

63171971 is a deficient number, since it is larger than the sum of its proper divisors (1).

63171971 is an equidigital number, since it uses as much as digits as its factorization.

63171971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7938, while the sum is 35.

The square root of 63171971 is about 7948.0797051867. The cubic root of 63171971 is about 398.2674460602.

The spelling of 63171971 in words is "sixty-three million, one hundred seventy-one thousand, nine hundred seventy-one".