319131643 has 2 divisors, whose sum is σ = 319131644. Its totient is φ = 319131642.

The previous prime is 319131611. The next prime is 319131671. The reversal of 319131643 is 346131913.

It is a strong prime.

It is an emirp because it is prime and its reverse (346131913) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 319131643 - 2⁵ = 319131611 is a prime.

It is not a weakly prime, because it can be changed into another prime (319431643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159565821 + 159565822.

It is an arithmetic number, because the mean of its divisors is an integer number (159565822).

Almost surely, 2^319131643 is an apocalyptic number.

319131643 is a deficient number, since it is larger than the sum of its proper divisors (1).

319131643 is an equidigital number, since it uses as much as digits as its factorization.

319131643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 31.

The square root of 319131643 is about 17864.2560158547. The cubic root of 319131643 is about 683.3711225318.

The spelling of 319131643 in words is "three hundred nineteen million, one hundred thirty-one thousand, six hundred forty-three".