311440344213 has 8 divisors (see below), whose sum is σ = 433308305088. Its totient is φ = 198599639744.

The previous prime is 311440344161. The next prime is 311440344221. The reversal of 311440344213 is 312443044113.

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

It is a cyclic number.

It is not a de Polignac number, because 311440344213 - 2²⁰ = 311439295637 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 (311440344263) 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, 2256814020 + ... + 2256814157.

It is an arithmetic number, because the mean of its divisors is an integer number (54163538136).

Almost surely, 2^311440344213 is an apocalyptic number.

It is an amenable number.

311440344213 is a deficient number, since it is larger than the sum of its proper divisors (121867960875).

311440344213 is a wasteful number, since it uses less digits than its factorization.

311440344213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4513628203.

The product of its (nonzero) digits is 13824, while the sum is 30.

Adding to 311440344213 its reverse (312443044113), we get a palindrome (623883388326).

The spelling of 311440344213 in words is "three hundred eleven billion, four hundred forty million, three hundred forty-four thousand, two hundred thirteen".