317881 has 4 divisors (see below), whose sum is σ = 320512. Its totient is φ = 315252.

The previous prime is 317857. The next prime is 317887. The reversal of 317881 is 188713.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 188713 = 7 ⋅26959.

It is a cyclic number.

It is not a de Polignac number, because 317881 - 2¹⁵ = 285113 is a prime.

It is a super-2 number, since 2×317881² = 202096660322, which contains 22 as substring.

It is a Duffinian number.

317881 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (317887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1125 + ... + 1378.

It is an arithmetic number, because the mean of its divisors is an integer number (80128).

2³¹⁷⁸⁸¹ is an apocalyptic number.

It is an amenable number.

317881 is a deficient number, since it is larger than the sum of its proper divisors (2631).

317881 is a wasteful number, since it uses less digits than its factorization.

317881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2630.

The product of its digits is 1344, while the sum is 28.

The square root of 317881 is about 563.8093649453. The cubic root of 317881 is about 68.2477267599.

Adding to 317881 its product of digits (1344), we get a square (319225 = 565²).

The spelling of 317881 in words is "three hundred seventeen thousand, eight hundred eighty-one".