171505216 has 21 divisors (see below), whose sum is σ = 340538689. Its totient is φ = 85700224.

The previous prime is 171505183. The next prime is 171505223. The reversal of 171505216 is 612505171.

The square root of 171505216 is 13096.

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

171505216 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 5198400 + 166306816 = 2280^2 + 12896^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 103950 + ... + 105586.

Almost surely, 2^171505216 is an apocalyptic number.

171505216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

171505216 is the 13096-th square number.

It is an amenable number.

171505216 is a deficient number, since it is larger than the sum of its proper divisors (169033473).

171505216 is an frugal number, since it uses more digits than its factorization.

171505216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3286 (or 1639 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 28.

The cubic root of 171505216 is about 555.5960007058.

It can be divided in two parts, 17150 and 5216, that added together give a triangular number (22366 = T₂₁₁).

The spelling of 171505216 in words is "one hundred seventy-one million, five hundred five thousand, two hundred sixteen".