311240343 has 4 divisors (see below), whose sum is σ = 414987128. Its totient is φ = 207493560.

The previous prime is 311240339. The next prime is 311240359. The reversal of 311240343 is 343042113.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 311240343 - 2² = 311240339 is a prime.

It is a super-2 number, since 2×311240343² = 193741102221515298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311240243) 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, 51873388 + ... + 51873393.

It is an arithmetic number, because the mean of its divisors is an integer number (103746782).

Almost surely, 2^311240343 is an apocalyptic number.

311240343 is a deficient number, since it is larger than the sum of its proper divisors (103746785).

311240343 is a wasteful number, since it uses less digits than its factorization.

311240343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103746784.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 311240343 is about 17642.0050731202. The cubic root of 311240343 is about 677.6913802371.

Adding to 311240343 its reverse (343042113), we get a palindrome (654282456).

The spelling of 311240343 in words is "three hundred eleven million, two hundred forty thousand, three hundred forty-three".