319188913 has 2 divisors, whose sum is σ = 319188914. Its totient is φ = 319188912.

The previous prime is 319188911. The next prime is 319188971. The reversal of 319188913 is 319881913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195356529 + 123832384 = 13977^2 + 11128^2 .

It is a cyclic number.

It is not a de Polignac number, because 319188913 - 2¹ = 319188911 is a prime.

Together with 319188911, 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 319188913.

It is not a weakly prime, because it can be changed into another prime (319188911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159594456 + 159594457.

It is an arithmetic number, because the mean of its divisors is an integer number (159594457).

Almost surely, 2^319188913 is an apocalyptic number.

It is an amenable number.

319188913 is a deficient number, since it is larger than the sum of its proper divisors (1).

319188913 is an equidigital number, since it uses as much as digits as its factorization.

319188913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 43.

The square root of 319188913 is about 17865.8588654450. The cubic root of 319188913 is about 683.4119983732.

The spelling of 319188913 in words is "three hundred nineteen million, one hundred eighty-eight thousand, nine hundred thirteen".