311081 has 4 divisors (see below), whose sum is σ = 315792. Its totient is φ = 306372.

The previous prime is 311041. The next prime is 311099. The reversal of 311081 is 180113.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311081 is a prime.

It is a super-3 number, since 3×311081³ = 90311220974833323, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311021) 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, 2255 + ... + 2388.

It is an arithmetic number, because the mean of its divisors is an integer number (78948).

2³¹¹⁰⁸¹ is an apocalyptic number.

It is an amenable number.

311081 is a deficient number, since it is larger than the sum of its proper divisors (4711).

311081 is an equidigital number, since it uses as much as digits as its factorization.

311081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4710.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 311081 is about 557.7463581235. The cubic root of 311081 is about 67.7575709916.

Adding to 311081 its reverse (180113), we get a palindrome (491194).

The spelling of 311081 in words is "three hundred eleven thousand, eighty-one".