163191971 has 2 divisors, whose sum is σ = 163191972. Its totient is φ = 163191970.

The previous prime is 163191949. The next prime is 163191979. The reversal of 163191971 is 179191361.

163191971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 163191971 - 2⁶ = 163191907 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (163191979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81595985 + 81595986.

It is an arithmetic number, because the mean of its divisors is an integer number (81595986).

Almost surely, 2^163191971 is an apocalyptic number.

163191971 is a deficient number, since it is larger than the sum of its proper divisors (1).

163191971 is an equidigital number, since it uses as much as digits as its factorization.

163191971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206, while the sum is 38.

The square root of 163191971 is about 12774.6612870949. The cubic root of 163191971 is about 546.4699213094.

The spelling of 163191971 in words is "one hundred sixty-three million, one hundred ninety-one thousand, nine hundred seventy-one".