319533564521 has 2 divisors, whose sum is σ = 319533564522. Its totient is φ = 319533564520.

The previous prime is 319533564499. The next prime is 319533564569. The reversal of 319533564521 is 125465335913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181591890496 + 137941674025 = 426136^2 + 371405^2 .

It is a cyclic number.

It is not a de Polignac number, because 319533564521 - 2¹⁴ = 319533548137 is a prime.

It is not a weakly prime, because it can be changed into another prime (319533561521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159766782260 + 159766782261.

It is an arithmetic number, because the mean of its divisors is an integer number (159766782261).

Almost surely, 2^319533564521 is an apocalyptic number.

It is an amenable number.

319533564521 is a deficient number, since it is larger than the sum of its proper divisors (1).

319533564521 is an equidigital number, since it uses as much as digits as its factorization.

319533564521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1458000, while the sum is 47.

The spelling of 319533564521 in words is "three hundred nineteen billion, five hundred thirty-three million, five hundred sixty-four thousand, five hundred twenty-one".