171560811601 has 3 divisors (see below), whose sum is σ = 171561225801. Its totient is φ = 171560397402.

The previous prime is 171560811553. The next prime is 171560811613. The reversal of 171560811601 is 106118065171.

The square root of 171560811601 is 414199.

It is a perfect power (a square), and thus also a powerful number.

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.

It is not a de Polignac number, because 171560811601 - 2¹³ = 171560803409 is a prime.

It is a super-2 number, since 2×171560811601² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171560811101) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 207100 + ... + 621298.

It is an arithmetic number, because the mean of its divisors is an integer number (57187075267).

Almost surely, 2^171560811601 is an apocalyptic number.

171560811601 is the 414199-th square number.

171560811601 is the 207100-th centered octagonal number.

It is an amenable number.

171560811601 is a deficient number, since it is larger than the sum of its proper divisors (414200).

171560811601 is an frugal number, since it uses more digits than its factorization.

171560811601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828398 (or 414199 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 37.

Adding to 171560811601 its reverse (106118065171), we get a palindrome (277678876772).

The spelling of 171560811601 in words is "one hundred seventy-one billion, five hundred sixty million, eight hundred eleven thousand, six hundred one".