171871253 has 4 divisors (see below), whose sum is σ = 176516460. Its totient is φ = 167226048.

The previous prime is 171871247. The next prime is 171871261. The reversal of 171871253 is 352178171.

It is a happy number.

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 157301764 + 14569489 = 12542^2 + 3817^2 .

It is a cyclic number.

It is not a de Polignac number, because 171871253 - 2²⁰ = 170822677 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 (171871213) 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, 2322548 + ... + 2322621.

It is an arithmetic number, because the mean of its divisors is an integer number (44129115).

Almost surely, 2^171871253 is an apocalyptic number.

It is an amenable number.

171871253 is a deficient number, since it is larger than the sum of its proper divisors (4645207).

171871253 is an equidigital number, since it uses as much as digits as its factorization.

171871253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4645206.

The product of its digits is 11760, while the sum is 35.

The square root of 171871253 is about 13109.9676963752. The cubic root of 171871253 is about 555.9909822477.

The spelling of 171871253 in words is "one hundred seventy-one million, eight hundred seventy-one thousand, two hundred fifty-three".