171428723 has 4 divisors (see below), whose sum is σ = 171454920. Its totient is φ = 171402528.

The previous prime is 171428717. The next prime is 171428737. The reversal of 171428723 is 327824171.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 327824171 = 151 ⋅2171021.

It is a cyclic number.

It is not a de Polignac number, because 171428723 - 2⁴ = 171428707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171428743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6011 + ... + 19467.

It is an arithmetic number, because the mean of its divisors is an integer number (42863730).

Almost surely, 2^171428723 is an apocalyptic number.

171428723 is a deficient number, since it is larger than the sum of its proper divisors (26197).

171428723 is a wasteful number, since it uses less digits than its factorization.

171428723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26196.

The product of its digits is 18816, while the sum is 35.

The square root of 171428723 is about 13093.0792023878. The cubic root of 171428723 is about 555.5133880099.

The spelling of 171428723 in words is "one hundred seventy-one million, four hundred twenty-eight thousand, seven hundred twenty-three".