321343531 has 2 divisors, whose sum is σ = 321343532. Its totient is φ = 321343530.

The previous prime is 321343507. The next prime is 321343619. The reversal of 321343531 is 135343123.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 321343531 - 2⁵ = 321343499 is a prime.

It is a super-2 number, since 2×321343531² = 206523329831095922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 321343496 and 321343505.

It is not a weakly prime, because it can be changed into another prime (321344531) 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, 160671765 + 160671766.

It is an arithmetic number, because the mean of its divisors is an integer number (160671766).

Almost surely, 2^321343531 is an apocalyptic number.

321343531 is a deficient number, since it is larger than the sum of its proper divisors (1).

321343531 is an equidigital number, since it uses as much as digits as its factorization.

321343531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 25.

The square root of 321343531 is about 17926.0573188864. The cubic root of 321343531 is about 684.9462944735.

Adding to 321343531 its reverse (135343123), we get a palindrome (456686654).

The spelling of 321343531 in words is "three hundred twenty-one million, three hundred forty-three thousand, five hundred thirty-one".