171118513 has 4 divisors (see below), whose sum is σ = 171549940. Its totient is φ = 170687088.

The previous prime is 171118501. The next prime is 171118517. The reversal of 171118513 is 315811171.

171118513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 86992929 + 84125584 = 9327^2 + 9172^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171118513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171118517) 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, 215118 + ... + 215911.

It is an arithmetic number, because the mean of its divisors is an integer number (42887485).

Almost surely, 2^171118513 is an apocalyptic number.

It is an amenable number.

171118513 is a deficient number, since it is larger than the sum of its proper divisors (431427).

171118513 is an equidigital number, since it uses as much as digits as its factorization.

171118513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431426.

The product of its digits is 840, while the sum is 28.

The square root of 171118513 is about 13081.2275035640. The cubic root of 171118513 is about 555.1781080285.

Adding to 171118513 its reverse (315811171), we get a palindrome (486929684).

The spelling of 171118513 in words is "one hundred seventy-one million, one hundred eighteen thousand, five hundred thirteen".