321231853 has 2 divisors, whose sum is σ = 321231854. Its totient is φ = 321231852.

The previous prime is 321231851. The next prime is 321231857. The reversal of 321231853 is 358132123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178142409 + 143089444 = 13347^2 + 11962^2 .

It is a cyclic number.

It is not a de Polignac number, because 321231853 - 2¹ = 321231851 is a prime.

Together with 321231851, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321231851) 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, 160615926 + 160615927.

It is an arithmetic number, because the mean of its divisors is an integer number (160615927).

Almost surely, 2^321231853 is an apocalyptic number.

It is an amenable number.

321231853 is a deficient number, since it is larger than the sum of its proper divisors (1).

321231853 is an equidigital number, since it uses as much as digits as its factorization.

321231853 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 28.

The square root of 321231853 is about 17922.9420854948. The cubic root of 321231853 is about 684.8669377644.

Adding to 321231853 its reverse (358132123), we get a palindrome (679363976).

The spelling of 321231853 in words is "three hundred twenty-one million, two hundred thirty-one thousand, eight hundred fifty-three".