171728639101 has 4 divisors (see below), whose sum is σ = 181830323772. Its totient is φ = 161626954432.

The previous prime is 171728639099. The next prime is 171728639111. The reversal of 171728639101 is 101936827171.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 128827873476 + 42900765625 = 358926^2 + 207125^2 .

It is a cyclic number.

It is not a de Polignac number, because 171728639101 - 2¹ = 171728639099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171728639111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5050842310 + ... + 5050842343.

It is an arithmetic number, because the mean of its divisors is an integer number (45457580943).

Almost surely, 2^171728639101 is an apocalyptic number.

It is an amenable number.

171728639101 is a deficient number, since it is larger than the sum of its proper divisors (10101684671).

171728639101 is a wasteful number, since it uses less digits than its factorization.

171728639101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10101684670.

The product of its (nonzero) digits is 127008, while the sum is 46.

The spelling of 171728639101 in words is "one hundred seventy-one billion, seven hundred twenty-eight million, six hundred thirty-nine thousand, one hundred one".