171225863 has 4 divisors (see below), whose sum is σ = 171263568. Its totient is φ = 171188160.

The previous prime is 171225833. The next prime is 171225877. The reversal of 171225863 is 368522171.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 368522171 = 599 ⋅615229.

It is a cyclic number.

It is not a de Polignac number, because 171225863 - 2¹⁸ = 170963719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171225833) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 10931 + ... + 21492.

It is an arithmetic number, because the mean of its divisors is an integer number (42815892).

Almost surely, 2^171225863 is an apocalyptic number.

171225863 is a deficient number, since it is larger than the sum of its proper divisors (37705).

171225863 is an equidigital number, since it uses as much as digits as its factorization.

171225863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37704.

The product of its digits is 20160, while the sum is 35.

The square root of 171225863 is about 13085.3300684392. The cubic root of 171225863 is about 555.2941794582.

The spelling of 171225863 in words is "one hundred seventy-one million, two hundred twenty-five thousand, eight hundred sixty-three".