211131313 has 4 divisors (see below), whose sum is σ = 223550820. Its totient is φ = 198711808.

The previous prime is 211131307. The next prime is 211131331. The reversal of 211131313 is 313131112.

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 105925264 + 105206049 = 10292^2 + 10257^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211131313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211131373) 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, 6209728 + ... + 6209761.

It is an arithmetic number, because the mean of its divisors is an integer number (55887705).

Almost surely, 2^211131313 is an apocalyptic number.

It is an amenable number.

211131313 is a deficient number, since it is larger than the sum of its proper divisors (12419507).

211131313 is a wasteful number, since it uses less digits than its factorization.

211131313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12419506.

The product of its digits is 54, while the sum is 16.

The square root of 211131313 is about 14530.3583231798. The cubic root of 211131313 is about 595.4576550989.

Adding to 211131313 its reverse (313131112), we get a palindrome (524262425).

The spelling of 211131313 in words is "two hundred eleven million, one hundred thirty-one thousand, three hundred thirteen".