171728879111 has 2 divisors, whose sum is σ = 171728879112. Its totient is φ = 171728879110.

The previous prime is 171728879099. The next prime is 171728879117. The reversal of 171728879111 is 111978827171.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171728879111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171728879117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85864439555 + 85864439556.

It is an arithmetic number, because the mean of its divisors is an integer number (85864439556).

Almost surely, 2^171728879111 is an apocalyptic number.

171728879111 is a deficient number, since it is larger than the sum of its proper divisors (1).

171728879111 is an equidigital number, since it uses as much as digits as its factorization.

171728879111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 395136, while the sum is 53.

The spelling of 171728879111 in words is "one hundred seventy-one billion, seven hundred twenty-eight million, eight hundred seventy-nine thousand, one hundred eleven".