343121111 has 4 divisors (see below), whose sum is σ = 343820424. Its totient is φ = 342421800.

The previous prime is 343121059. The next prime is 343121147. The reversal of 343121111 is 111121343.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-343121111 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 343121111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (343121161) 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, 348920 + ... + 349901.

It is an arithmetic number, because the mean of its divisors is an integer number (85955106).

Almost surely, 2^343121111 is an apocalyptic number.

343121111 is a deficient number, since it is larger than the sum of its proper divisors (699313).

343121111 is an equidigital number, since it uses as much as digits as its factorization.

343121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699312.

The product of its digits is 72, while the sum is 17.

The square root of 343121111 is about 18523.5285785403. The cubic root of 343121111 is about 700.0823787403.

Adding to 343121111 its reverse (111121343), we get a palindrome (454242454).

It can be divided in two parts, 3431 and 21111, that added together give a palindrome (24542).

The spelling of 343121111 in words is "three hundred forty-three million, one hundred twenty-one thousand, one hundred eleven".