343531 has 2 divisors, whose sum is σ = 343532. Its totient is φ = 343530.

The previous prime is 343529. The next prime is 343543. The reversal of 343531 is 135343.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 343531 - 2¹ = 343529 is a prime.

It is a super-2 number, since 2×343531² = 236027095922, which contains 22 as substring.

Together with 343529, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 343499 and 343508.

It is not a weakly prime, because it can be changed into another prime (343561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171765 + 171766.

It is an arithmetic number, because the mean of its divisors is an integer number (171766).

2³⁴³⁵³¹ is an apocalyptic number.

343531 is a deficient number, since it is larger than the sum of its proper divisors (1).

343531 is an equidigital number, since it uses as much as digits as its factorization.

343531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 19.

The square root of 343531 is about 586.1151763945. The cubic root of 343531 is about 70.0361038245.

Adding to 343531 its reverse (135343), we get a palindrome (478874).

It can be divided in two parts, 3 and 43531, that added together give a palindrome (43534).

The spelling of 343531 in words is "three hundred forty-three thousand, five hundred thirty-one".