159611971 has 2 divisors, whose sum is σ = 159611972. Its totient is φ = 159611970.

The previous prime is 159611941. The next prime is 159611981. The reversal of 159611971 is 179116951.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 159611971 - 2⁵ = 159611939 is a prime.

It is not a weakly prime, because it can be changed into another prime (159611941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79805985 + 79805986.

It is an arithmetic number, because the mean of its divisors is an integer number (79805986).

Almost surely, 2^159611971 is an apocalyptic number.

159611971 is a deficient number, since it is larger than the sum of its proper divisors (1).

159611971 is an equidigital number, since it uses as much as digits as its factorization.

159611971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17010, while the sum is 40.

The square root of 159611971 is about 12633.7631369280. The cubic root of 159611971 is about 542.4443044184. Note that the first 3 decimals are identical.

The spelling of 159611971 in words is "one hundred fifty-nine million, six hundred eleven thousand, nine hundred seventy-one".