813554455321 has 2 divisors, whose sum is σ = 813554455322. Its totient is φ = 813554455320.

The previous prime is 813554455283. The next prime is 813554455333. The reversal of 813554455321 is 123554455318.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 694347225625 + 119207229696 = 833275^2 + 345264^2 .

It is a cyclic number.

It is not a de Polignac number, because 813554455321 - 2¹⁵ = 813554422553 is a prime.

It is not a weakly prime, because it can be changed into another prime (813554455391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406777227660 + 406777227661.

It is an arithmetic number, because the mean of its divisors is an integer number (406777227661).

Almost surely, 2^813554455321 is an apocalyptic number.

It is an amenable number.

813554455321 is a deficient number, since it is larger than the sum of its proper divisors (1).

813554455321 is an equidigital number, since it uses as much as digits as its factorization.

813554455321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440000, while the sum is 46.

The spelling of 813554455321 in words is "eight hundred thirteen billion, five hundred fifty-four million, four hundred fifty-five thousand, three hundred twenty-one".