311131 has 4 divisors (see below), whose sum is σ = 312664. Its totient is φ = 309600.

The previous prime is 311123. The next prime is 311137. The reversal of 311131 is 131113.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 311131 - 2³ = 311123 is a prime.

It is a super-2 number, since 2×311131² = 193604998322, which contains 22 as substring.

It is a Duffinian number.

311131 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (311137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 405 + ... + 886.

It is an arithmetic number, because the mean of its divisors is an integer number (78166).

2³¹¹¹³¹ is an apocalyptic number.

311131 is a deficient number, since it is larger than the sum of its proper divisors (1533).

311131 is a wasteful number, since it uses less digits than its factorization.

311131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1532.

The product of its digits is 9, while the sum is 10.

The square root of 311131 is about 557.7911795645. The cubic root of 311131 is about 67.7612010184.

Adding to 311131 its reverse (131113), we get a palindrome (442244).

The spelling of 311131 in words is "three hundred eleven thousand, one hundred thirty-one".