171205481 has 2 divisors, whose sum is σ = 171205482. Its totient is φ = 171205480.

The previous prime is 171205477. The next prime is 171205483. The reversal of 171205481 is 184502171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129163225 + 42042256 = 11365^2 + 6484^2 .

It is a cyclic number.

It is not a de Polignac number, because 171205481 - 2² = 171205477 is a prime.

It is a super-2 number, since 2×171205481² = 58622633448882722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 171205483, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (171205483) 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, 85602740 + 85602741.

It is an arithmetic number, because the mean of its divisors is an integer number (85602741).

Almost surely, 2^171205481 is an apocalyptic number.

It is an amenable number.

171205481 is a deficient number, since it is larger than the sum of its proper divisors (1).

171205481 is an equidigital number, since it uses as much as digits as its factorization.

171205481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 171205481 is about 13084.5512341845. The cubic root of 171205481 is about 555.2721452965.

The spelling of 171205481 in words is "one hundred seventy-one million, two hundred five thousand, four hundred eighty-one".