319972909 has 2 divisors, whose sum is σ = 319972910. Its totient is φ = 319972908.

The previous prime is 319972903. The next prime is 319972927. The reversal of 319972909 is 909279913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 228674884 + 91298025 = 15122^2 + 9555^2 .

It is an emirp because it is prime and its reverse (909279913) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 319972909 - 2¹⁵ = 319940141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (319972903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159986454 + 159986455.

It is an arithmetic number, because the mean of its divisors is an integer number (159986455).

Almost surely, 2^319972909 is an apocalyptic number.

It is an amenable number.

319972909 is a deficient number, since it is larger than the sum of its proper divisors (1).

319972909 is an equidigital number, since it uses as much as digits as its factorization.

319972909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 275562, while the sum is 49.

The square root of 319972909 is about 17887.7865875015. The cubic root of 319972909 is about 683.9710760600.

The spelling of 319972909 in words is "three hundred nineteen million, nine hundred seventy-two thousand, nine hundred nine".