311231223213 has 8 divisors (see below), whose sum is σ = 416309290176. Its totient is φ = 206820319200.

The previous prime is 311231223133. The next prime is 311231223229. The reversal of 311231223213 is 312322132113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 311231223213 - 2¹⁰ = 311231222189 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311231223253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166789648 + ... + 166791513.

It is an arithmetic number, because the mean of its divisors is an integer number (52038661272).

Almost surely, 2^311231223213 is an apocalyptic number.

It is an amenable number.

311231223213 is a deficient number, since it is larger than the sum of its proper divisors (105078066963).

311231223213 is a wasteful number, since it uses less digits than its factorization.

311231223213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333581475.

The product of its digits is 1296, while the sum is 24.

Adding to 311231223213 its reverse (312322132113), we get a palindrome (623553355326).

The spelling of 311231223213 in words is "three hundred eleven billion, two hundred thirty-one million, two hundred twenty-three thousand, two hundred thirteen".