171320725 has 12 divisors (see below), whose sum is σ = 219291520. Its totient is φ = 132634800.

The previous prime is 171320683. The next prime is 171320749. The reversal of 171320725 is 527023171.

It is not a de Polignac number, because 171320725 - 2¹¹ = 171318677 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 171320693 and 171320702.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 109755 + ... + 111304.

Almost surely, 2^171320725 is an apocalyptic number.

It is an amenable number.

171320725 is a deficient number, since it is larger than the sum of its proper divisors (47970795).

171320725 is a wasteful number, since it uses less digits than its factorization.

171320725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221100 (or 221095 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 171320725 is about 13088.9543127020. The cubic root of 171320725 is about 555.3967079561.

Adding to 171320725 its reverse (527023171), we get a palindrome (698343896).

The spelling of 171320725 in words is "one hundred seventy-one million, three hundred twenty thousand, seven hundred twenty-five".