171968081 has 2 divisors, whose sum is σ = 171968082. Its totient is φ = 171968080.

The previous prime is 171968077. The next prime is 171968087. The reversal of 171968081 is 180869171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116985856 + 54982225 = 10816^2 + 7415^2 .

It is a cyclic number.

It is not a de Polignac number, because 171968081 - 2² = 171968077 is a prime.

It is a super-2 number, since 2×171968081² = 59146041765645122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (171968087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85984040 + 85984041.

It is an arithmetic number, because the mean of its divisors is an integer number (85984041).

Almost surely, 2^171968081 is an apocalyptic number.

It is an amenable number.

171968081 is a deficient number, since it is larger than the sum of its proper divisors (1).

171968081 is an equidigital number, since it uses as much as digits as its factorization.

171968081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 41.

The square root of 171968081 is about 13113.6600916754. The cubic root of 171968081 is about 556.0953731550.

The spelling of 171968081 in words is "one hundred seventy-one million, nine hundred sixty-eight thousand, eighty-one".