319197509 has 2 divisors, whose sum is σ = 319197510. Its totient is φ = 319197508.

The previous prime is 319197503. The next prime is 319197547. The reversal of 319197509 is 905791913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 302412100 + 16785409 = 17390^2 + 4097^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-319197509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 319197509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (319197503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159598754 + 159598755.

It is an arithmetic number, because the mean of its divisors is an integer number (159598755).

Almost surely, 2^319197509 is an apocalyptic number.

It is an amenable number.

319197509 is a deficient number, since it is larger than the sum of its proper divisors (1).

319197509 is an equidigital number, since it uses as much as digits as its factorization.

319197509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 76545, while the sum is 44.

The square root of 319197509 is about 17866.0994344037. The cubic root of 319197509 is about 683.4181332530.

The spelling of 319197509 in words is "three hundred nineteen million, one hundred ninety-seven thousand, five hundred nine".