319332821 has 2 divisors, whose sum is σ = 319332822. Its totient is φ = 319332820.

The previous prime is 319332809. The next prime is 319332847. The reversal of 319332821 is 128233913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182115025 + 137217796 = 13495^2 + 11714^2 .

It is a cyclic number.

It is not a de Polignac number, because 319332821 - 2¹⁰ = 319331797 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (319332421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159666410 + 159666411.

It is an arithmetic number, because the mean of its divisors is an integer number (159666411).

Almost surely, 2^319332821 is an apocalyptic number.

It is an amenable number.

319332821 is a deficient number, since it is larger than the sum of its proper divisors (1).

319332821 is an equidigital number, since it uses as much as digits as its factorization.

319332821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 32.

The square root of 319332821 is about 17869.8858698090. The cubic root of 319332821 is about 683.5146895729.

The spelling of 319332821 in words is "three hundred nineteen million, three hundred thirty-two thousand, eight hundred twenty-one".