171913897 has 4 divisors (see below), whose sum is σ = 172090836. Its totient is φ = 171736960.

The previous prime is 171913873. The next prime is 171913939. The reversal of 171913897 is 798319171.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 798319171 = 13 ⋅61409167.

It can be written as a sum of positive squares in 2 ways, for example, as 166642281 + 5271616 = 12909^2 + 2296^2 .

It is a cyclic number.

It is not a de Polignac number, because 171913897 - 2¹¹ = 171911849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171913837) 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, 87004 + ... + 88957.

It is an arithmetic number, because the mean of its divisors is an integer number (43022709).

Almost surely, 2^171913897 is an apocalyptic number.

It is an amenable number.

171913897 is a deficient number, since it is larger than the sum of its proper divisors (176939).

171913897 is an equidigital number, since it uses as much as digits as its factorization.

171913897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176938.

The product of its digits is 95256, while the sum is 46.

The square root of 171913897 is about 13111.5939915786. The cubic root of 171913897 is about 556.0369618562.

The spelling of 171913897 in words is "one hundred seventy-one million, nine hundred thirteen thousand, eight hundred ninety-seven".