319408391 has 2 divisors, whose sum is σ = 319408392. Its totient is φ = 319408390.

The previous prime is 319408379. The next prime is 319408417. The reversal of 319408391 is 193804913.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 319408391 - 2¹⁰ = 319407367 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (319408351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159704195 + 159704196.

It is an arithmetic number, because the mean of its divisors is an integer number (159704196).

Almost surely, 2^319408391 is an apocalyptic number.

319408391 is a deficient number, since it is larger than the sum of its proper divisors (1).

319408391 is an equidigital number, since it uses as much as digits as its factorization.

319408391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 319408391 is about 17872.0001958371. Note that the first 3 decimals coincide. The cubic root of 319408391 is about 683.5686031574.

The spelling of 319408391 in words is "three hundred nineteen million, four hundred eight thousand, three hundred ninety-one".