171345521 has 8 divisors (see below), whose sum is σ = 172495680. Its totient is φ = 170199792.

The previous prime is 171345467. The next prime is 171345539. The reversal of 171345521 is 125543171.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 171345521 - 2¹⁰ = 171344497 is a prime.

It is a super-2 number, since 2×171345521² = 58718575133522882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171345541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110276 + ... + 111818.

It is an arithmetic number, because the mean of its divisors is an integer number (21561960).

Almost surely, 2^171345521 is an apocalyptic number.

It is an amenable number.

171345521 is a deficient number, since it is larger than the sum of its proper divisors (1150159).

171345521 is a wasteful number, since it uses less digits than its factorization.

171345521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2215.

The product of its digits is 4200, while the sum is 29.

The square root of 171345521 is about 13089.9014893161. The cubic root of 171345521 is about 555.4235016640.

Adding to 171345521 its reverse (125543171), we get a palindrome (296888692).

The spelling of 171345521 in words is "one hundred seventy-one million, three hundred forty-five thousand, five hundred twenty-one".