161317 has 4 divisors (see below), whose sum is σ = 173740. Its totient is φ = 148896.

The previous prime is 161309. The next prime is 161323. The reversal of 161317 is 713161.

It is a happy number.

161317 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 12321 + 148996 = 111^2 + 386^2 .

It is a cyclic number.

It is not a de Polignac number, because 161317 - 2³ = 161309 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161294 and 161303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161377) 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, 6192 + ... + 6217.

It is an arithmetic number, because the mean of its divisors is an integer number (43435).

2¹⁶¹³¹⁷ is an apocalyptic number.

It is an amenable number.

161317 is a deficient number, since it is larger than the sum of its proper divisors (12423).

161317 is a wasteful number, since it uses less digits than its factorization.

161317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12422.

The product of its digits is 126, while the sum is 19.

The square root of 161317 is about 401.6428761973. The cubic root of 161317 is about 54.4368991657.

Adding to 161317 its reverse (713161), we get a palindrome (874478).

The spelling of 161317 in words is "one hundred sixty-one thousand, three hundred seventeen".