171638713 has 4 divisors (see below), whose sum is σ = 171665140. Its totient is φ = 171612288.

The previous prime is 171638711. The next prime is 171638717. The reversal of 171638713 is 317836171.

It is a happy number.

It is the 5349-th star number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 317836171 = 277 ⋅1147423.

It can be written as a sum of positive squares in 2 ways, for example, as 127509264 + 44129449 = 11292^2 + 6643^2 .

It is a cyclic number.

It is not a de Polignac number, because 171638713 - 2¹ = 171638711 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171638711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4033 + ... + 18961.

It is an arithmetic number, because the mean of its divisors is an integer number (42916285).

Almost surely, 2^171638713 is an apocalyptic number.

It is an amenable number.

171638713 is a deficient number, since it is larger than the sum of its proper divisors (26427).

171638713 is a wasteful number, since it uses less digits than its factorization.

171638713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26426.

The product of its digits is 21168, while the sum is 37.

The square root of 171638713 is about 13101.0958701935. The cubic root of 171638713 is about 555.7401190889.

The spelling of 171638713 in words is "one hundred seventy-one million, six hundred thirty-eight thousand, seven hundred thirteen".