171280385 has 4 divisors (see below), whose sum is σ = 205536468. Its totient is φ = 137024304.

The previous prime is 171280381. The next prime is 171280427. The reversal of 171280385 is 583082171.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60357361 + 110923024 = 7769^2 + 10532^2 .

It is a cyclic number.

It is not a de Polignac number, because 171280385 - 2² = 171280381 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171280381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17128034 + ... + 17128043.

It is an arithmetic number, because the mean of its divisors is an integer number (51384117).

Almost surely, 2^171280385 is an apocalyptic number.

It is an amenable number.

171280385 is a deficient number, since it is larger than the sum of its proper divisors (34256083).

171280385 is an equidigital number, since it uses as much as digits as its factorization.

171280385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34256082.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 171280385 is about 13087.4132279836. The cubic root of 171280385 is about 555.3531124095.

The spelling of 171280385 in words is "one hundred seventy-one million, two hundred eighty thousand, three hundred eighty-five".