321493553 has 2 divisors, whose sum is σ = 321493554. Its totient is φ = 321493552.

The previous prime is 321493463. The next prime is 321493561. The reversal of 321493553 is 355394123.

321493553 is nontrivially palindromic in base 4.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 320517409 + 976144 = 17903^2 + 988^2 .

It is a cyclic number.

It is not a de Polignac number, because 321493553 - 2⁸ = 321493297 is a prime.

It is not a weakly prime, because it can be changed into another prime (321193553) 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, 160746776 + 160746777.

It is an arithmetic number, because the mean of its divisors is an integer number (160746777).

Almost surely, 2^321493553 is an apocalyptic number.

It is an amenable number.

321493553 is a deficient number, since it is larger than the sum of its proper divisors (1).

321493553 is an equidigital number, since it uses as much as digits as its factorization.

321493553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48600, while the sum is 35.

The square root of 321493553 is about 17930.2412978744. The cubic root of 321493553 is about 685.0528689192.

The spelling of 321493553 in words is "three hundred twenty-one million, four hundred ninety-three thousand, five hundred fifty-three".