343521 has 10 divisors (see below), whose sum is σ = 513282. Its totient is φ = 228960.

The previous prime is 343517. The next prime is 343529. The reversal of 343521 is 125343.

343521 is nontrivially palindromic in base 15.

It can be written as a sum of positive squares in only one way, i.e., 342225 + 1296 = 585^2 + 36^2 .

It is not a de Polignac number, because 343521 - 2² = 343517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 343494 and 343503.

It is not an unprimeable number, because it can be changed into a prime (343529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2040 + ... + 2201.

2³⁴³⁵²¹ is an apocalyptic number.

It is an amenable number.

343521 is a deficient number, since it is larger than the sum of its proper divisors (169761).

343521 is an equidigital number, since it uses as much as digits as its factorization.

343521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4253 (or 4244 counting only the distinct ones).

The product of its digits is 360, while the sum is 18.

The square root of 343521 is about 586.1066455859. The cubic root of 343521 is about 70.0354242470.

Adding to 343521 its reverse (125343), we get a palindrome (468864).

The spelling of 343521 in words is "three hundred forty-three thousand, five hundred twenty-one".