319891483861 has 2 divisors, whose sum is σ = 319891483862. Its totient is φ = 319891483860.

The previous prime is 319891483859. The next prime is 319891483927. The reversal of 319891483861 is 168384198913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179198975761 + 140692508100 = 423319^2 + 375090^2 .

It is a cyclic number.

It is not a de Polignac number, because 319891483861 - 2¹ = 319891483859 is a prime.

It is a super-2 number, since 2×319891483861² (a number of 24 digits) contains 22 as substring.

Together with 319891483859, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 319891483861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (319891483061) 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, 159945741930 + 159945741931.

It is an arithmetic number, because the mean of its divisors is an integer number (159945741931).

Almost surely, 2^319891483861 is an apocalyptic number.

It is an amenable number.

319891483861 is a deficient number, since it is larger than the sum of its proper divisors (1).

319891483861 is an equidigital number, since it uses as much as digits as its factorization.

319891483861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8957952, while the sum is 61.

The spelling of 319891483861 in words is "three hundred nineteen billion, eight hundred ninety-one million, four hundred eighty-three thousand, eight hundred sixty-one".