319497691 has 2 divisors, whose sum is σ = 319497692. Its totient is φ = 319497690.

The previous prime is 319497679. The next prime is 319497719. The reversal of 319497691 is 196794913.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 319497691 - 2²¹ = 317400539 is a prime.

It is not a weakly prime, because it can be changed into another prime (319497631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159748845 + 159748846.

It is an arithmetic number, because the mean of its divisors is an integer number (159748846).

Almost surely, 2^319497691 is an apocalyptic number.

319497691 is a deficient number, since it is larger than the sum of its proper divisors (1).

319497691 is an equidigital number, since it uses as much as digits as its factorization.

319497691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 49.

The square root of 319497691 is about 17874.4983426109. The cubic root of 319497691 is about 683.6323011170.

The spelling of 319497691 in words is "three hundred nineteen million, four hundred ninety-seven thousand, six hundred ninety-one".