171728887273 has 2 divisors, whose sum is σ = 171728887274. Its totient is φ = 171728887272.

The previous prime is 171728887261. The next prime is 171728887339. The reversal of 171728887273 is 372788827171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159689750544 + 12039136729 = 399612^2 + 109723^2 .

It is a cyclic number.

It is not a de Polignac number, because 171728887273 - 2⁹ = 171728886761 is a prime.

It is not a weakly prime, because it can be changed into another prime (171728887223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85864443636 + 85864443637.

It is an arithmetic number, because the mean of its divisors is an integer number (85864443637).

Almost surely, 2^171728887273 is an apocalyptic number.

It is an amenable number.

171728887273 is a deficient number, since it is larger than the sum of its proper divisors (1).

171728887273 is an equidigital number, since it uses as much as digits as its factorization.

171728887273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14751744, while the sum is 61.

The spelling of 171728887273 in words is "one hundred seventy-one billion, seven hundred twenty-eight million, eight hundred eighty-seven thousand, two hundred seventy-three".