1728101 has 4 divisors (see below), whose sum is σ = 1829772. Its totient is φ = 1626432.

The previous prime is 1728091. The next prime is 1728119. The reversal of 1728101 is 1018271.

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 1560001 + 168100 = 1249^2 + 410^2 .

It is a cyclic number.

It is not a de Polignac number, because 1728101 - 2¹⁸ = 1465957 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 (1728121) 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, 50810 + ... + 50843.

It is an arithmetic number, because the mean of its divisors is an integer number (457443).

2^1728101 is an apocalyptic number.

It is an amenable number.

1728101 is a deficient number, since it is larger than the sum of its proper divisors (101671).

1728101 is a wasteful number, since it uses less digits than its factorization.

1728101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101670.

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 1728101 is about 1314.5725541027. The cubic root of 1728101 is about 120.0023379174.

The spelling of 1728101 in words is "one million, seven hundred twenty-eight thousand, one hundred one".