171449824225 has 9 divisors (see below), whose sum is σ = 212600349273. Its totient is φ = 137158203120.

The previous prime is 171449824207. The next prime is 171449824291. The reversal of 171449824225 is 522428944171.

The square root of 171449824225 is 414065.

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

It can be written as a sum of positive squares in 4 ways, for example, as 1527793569 + 169922030656 = 39087^2 + 412216^2 .

It is not a de Polignac number, because 171449824225 - 2⁵ = 171449824193 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2028919 + ... + 2111731.

Almost surely, 2^171449824225 is an apocalyptic number.

171449824225 is the 414065-th square number.

171449824225 is the 207033-rd centered octagonal number.

It is an amenable number.

171449824225 is a deficient number, since it is larger than the sum of its proper divisors (41150525048).

171449824225 is an frugal number, since it uses more digits than its factorization.

171449824225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165636 (or 82818 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 49.

Multiplying 171449824225 by its sum of digits (49), we get a square (8401041387025 = 2898455²).

The spelling of 171449824225 in words is "one hundred seventy-one billion, four hundred forty-nine million, eight hundred twenty-four thousand, two hundred twenty-five".