319238465081 has 2 divisors, whose sum is σ = 319238465082. Its totient is φ = 319238465080.

The previous prime is 319238465071. The next prime is 319238465083. The reversal of 319238465081 is 180564832913.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 259504661056 + 59733804025 = 509416^2 + 244405^2 .

It is an emirp because it is prime and its reverse (180564832913) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 319238465081 - 2³⁰ = 318164723257 is a prime.

It is a super-2 number, since 2×319238465081² (a number of 24 digits) contains 22 as substring.

Together with 319238465083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (319238465083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159619232540 + 159619232541.

It is an arithmetic number, because the mean of its divisors is an integer number (159619232541).

Almost surely, 2^319238465081 is an apocalyptic number.

It is an amenable number.

319238465081 is a deficient number, since it is larger than the sum of its proper divisors (1).

319238465081 is an equidigital number, since it uses as much as digits as its factorization.

319238465081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1244160, while the sum is 50.

The spelling of 319238465081 in words is "three hundred nineteen billion, two hundred thirty-eight million, four hundred sixty-five thousand, eighty-one".