211231313 has 4 divisors (see below), whose sum is σ = 211308708. Its totient is φ = 211153920.

The previous prime is 211231297. The next prime is 211231327. The reversal of 211231313 is 313132112.

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 102070609 + 109160704 = 10103^2 + 10448^2 .

It is a cyclic number.

It is not a de Polignac number, because 211231313 - 2⁴ = 211231297 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211231291 and 211231300.

It is not an unprimeable number, because it can be changed into a prime (211236313) 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, 34448 + ... + 40113.

It is an arithmetic number, because the mean of its divisors is an integer number (52827177).

Almost surely, 2^211231313 is an apocalyptic number.

It is an amenable number.

211231313 is a deficient number, since it is larger than the sum of its proper divisors (77395).

211231313 is an equidigital number, since it uses as much as digits as its factorization.

211231313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77394.

The product of its digits is 108, while the sum is 17.

The square root of 211231313 is about 14533.7989871884. The cubic root of 211231313 is about 595.5516508940.

Adding to 211231313 its reverse (313132112), we get a palindrome (524363425).

The spelling of 211231313 in words is "two hundred eleven million, two hundred thirty-one thousand, three hundred thirteen".