163541971 has 2 divisors, whose sum is σ = 163541972. Its totient is φ = 163541970.

The previous prime is 163541951. The next prime is 163542011. The reversal of 163541971 is 179145361.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 163541971 - 2¹¹ = 163539923 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 163541971.

It is not a weakly prime, because it can be changed into another prime (163541951) 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, 81770985 + 81770986.

It is an arithmetic number, because the mean of its divisors is an integer number (81770986).

Almost surely, 2^163541971 is an apocalyptic number.

163541971 is a deficient number, since it is larger than the sum of its proper divisors (1).

163541971 is an equidigital number, since it uses as much as digits as its factorization.

163541971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 37.

The square root of 163541971 is about 12788.3529432058. The cubic root of 163541971 is about 546.8603161271.

The spelling of 163541971 in words is "one hundred sixty-three million, five hundred forty-one thousand, nine hundred seventy-one".