211131 has 6 divisors (see below), whose sum is σ = 304980. Its totient is φ = 140748.

The previous prime is 211129. The next prime is 211151. The reversal of 211131 is 131112.

It is not a de Polignac number, because 211131 - 2¹ = 211129 is a prime.

It is a super-2 number, since 2×211131² = 89152598322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 23459 = 211131 / (2 + 1 + 1 + 1 + 3 + 1).

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (211151) 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 5 ways as a sum of consecutive naturals, for example, 11721 + ... + 11738.

It is an arithmetic number, because the mean of its divisors is an integer number (50830).

2²¹¹¹³¹ is an apocalyptic number.

211131 is a deficient number, since it is larger than the sum of its proper divisors (93849).

211131 is a wasteful number, since it uses less digits than its factorization.

211131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23465 (or 23462 counting only the distinct ones).

The product of its digits is 6, while the sum is 9.

The square root of 211131 is about 459.4899346014. The cubic root of 211131 is about 59.5457360845.

Adding to 211131 its reverse (131112), we get a palindrome (342243).

The spelling of 211131 in words is "two hundred eleven thousand, one hundred thirty-one".