321554552393 has 2 divisors, whose sum is σ = 321554552394. Its totient is φ = 321554552392.

The previous prime is 321554552357. The next prime is 321554552419. The reversal of 321554552393 is 393255455123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 320341284169 + 1213268224 = 565987^2 + 34832^2 .

It is a cyclic number.

It is not a de Polignac number, because 321554552393 - 2¹⁰ = 321554551369 is a prime.

It is not a weakly prime, because it can be changed into another prime (321554552303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160777276196 + 160777276197.

It is an arithmetic number, because the mean of its divisors is an integer number (160777276197).

Almost surely, 2^321554552393 is an apocalyptic number.

It is an amenable number.

321554552393 is a deficient number, since it is larger than the sum of its proper divisors (1).

321554552393 is an equidigital number, since it uses as much as digits as its factorization.

321554552393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2430000, while the sum is 47.

The spelling of 321554552393 in words is "three hundred twenty-one billion, five hundred fifty-four million, five hundred fifty-two thousand, three hundred ninety-three".