163871971 has 2 divisors, whose sum is σ = 163871972. Its totient is φ = 163871970.

The previous prime is 163871909. The next prime is 163871977. The reversal of 163871971 is 179178361.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (179178361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163871971 - 2⁷ = 163871843 is a prime.

It is not a weakly prime, because it can be changed into another prime (163871977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81935985 + 81935986.

It is an arithmetic number, because the mean of its divisors is an integer number (81935986).

Almost surely, 2^163871971 is an apocalyptic number.

163871971 is a deficient number, since it is larger than the sum of its proper divisors (1).

163871971 is an equidigital number, since it uses as much as digits as its factorization.

163871971 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 163871971 is about 12801.2488062689. The cubic root of 163871971 is about 547.2278928359.

The spelling of 163871971 in words is "one hundred sixty-three million, eight hundred seventy-one thousand, nine hundred seventy-one".