321534431 has 2 divisors, whose sum is σ = 321534432. Its totient is φ = 321534430.

The previous prime is 321534419. The next prime is 321534443. The reversal of 321534431 is 134435123.

It is a balanced prime because it is at equal distance from previous prime (321534419) and next prime (321534443).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321534431 is a prime.

It is a super-2 number, since 2×321534431² = 206768780636987522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 321534431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321534491) 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 as a sum of consecutive naturals, namely, 160767215 + 160767216.

It is an arithmetic number, because the mean of its divisors is an integer number (160767216).

Almost surely, 2^321534431 is an apocalyptic number.

321534431 is a deficient number, since it is larger than the sum of its proper divisors (1).

321534431 is an equidigital number, since it uses as much as digits as its factorization.

321534431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 26.

The square root of 321534431 is about 17931.3811793738. The cubic root of 321534431 is about 685.0819025801.

Adding to 321534431 its reverse (134435123), we get a palindrome (455969554).

The spelling of 321534431 in words is "three hundred twenty-one million, five hundred thirty-four thousand, four hundred thirty-one".