211131113 has 4 divisors (see below), whose sum is σ = 211163988. Its totient is φ = 211098240.

The previous prime is 211131101. The next prime is 211131119. The reversal of 211131113 is 311131112.

It is a happy number.

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 126270169 + 84860944 = 11237^2 + 9212^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211131113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211131119) 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, 3308 + ... + 20813.

It is an arithmetic number, because the mean of its divisors is an integer number (52790997).

Almost surely, 2^211131113 is an apocalyptic number.

It is an amenable number.

211131113 is a deficient number, since it is larger than the sum of its proper divisors (32875).

211131113 is an equidigital number, since it uses as much as digits as its factorization.

211131113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32874.

The product of its digits is 18, while the sum is 14.

The square root of 211131113 is about 14530.3514410354. The cubic root of 211131113 is about 595.4574670775.

Adding to 211131113 its reverse (311131112), we get a palindrome (522262225).

Subtracting 211131113 from its reverse (311131112), we obtain a palindrome (99999999).

The spelling of 211131113 in words is "two hundred eleven million, one hundred thirty-one thousand, one hundred thirteen".