311443235213 has 4 divisors (see below), whose sum is σ = 339756256608. Its totient is φ = 283130213820.

The previous prime is 311443235209. The next prime is 311443235231. The reversal of 311443235213 is 312532344113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 311443235213 - 2² = 311443235209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 311443235213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311443235263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14156510681 + ... + 14156510702.

It is an arithmetic number, because the mean of its divisors is an integer number (84939064152).

Almost surely, 2^311443235213 is an apocalyptic number.

It is an amenable number.

311443235213 is a deficient number, since it is larger than the sum of its proper divisors (28313021395).

311443235213 is a wasteful number, since it uses less digits than its factorization.

311443235213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28313021394.

The product of its digits is 25920, while the sum is 32.

Adding to 311443235213 its reverse (312532344113), we get a palindrome (623975579326).

The spelling of 311443235213 in words is "three hundred eleven billion, four hundred forty-three million, two hundred thirty-five thousand, two hundred thirteen".