160171721 has 2 divisors, whose sum is σ = 160171722. Its totient is φ = 160171720.

The previous prime is 160171703. The next prime is 160171763. The reversal of 160171721 is 127171061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147355321 + 12816400 = 12139^2 + 3580^2 .

It is a cyclic number.

It is not a de Polignac number, because 160171721 - 2²⁶ = 93062857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (160171771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80085860 + 80085861.

It is an arithmetic number, because the mean of its divisors is an integer number (80085861).

Almost surely, 2^160171721 is an apocalyptic number.

It is an amenable number.

160171721 is a deficient number, since it is larger than the sum of its proper divisors (1).

160171721 is an equidigital number, since it uses as much as digits as its factorization.

160171721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 588, while the sum is 26.

The square root of 160171721 is about 12655.8966888957. The cubic root of 160171721 is about 543.0776715901.

The spelling of 160171721 in words is "one hundred sixty million, one hundred seventy-one thousand, seven hundred twenty-one".