317143778531 has 2 divisors, whose sum is σ = 317143778532. Its totient is φ = 317143778530.

The previous prime is 317143778491. The next prime is 317143778563. The reversal of 317143778531 is 135877341713.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 317143778531 - 2²² = 317139584227 is a prime.

It is a super-2 number, since 2×317143778531² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 317143778531.

It is not a weakly prime, because it can be changed into another prime (317143778591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158571889265 + 158571889266.

It is an arithmetic number, because the mean of its divisors is an integer number (158571889266).

Almost surely, 2^317143778531 is an apocalyptic number.

317143778531 is a deficient number, since it is larger than the sum of its proper divisors (1).

317143778531 is an equidigital number, since it uses as much as digits as its factorization.

317143778531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1481760, while the sum is 50.

The spelling of 317143778531 in words is "three hundred seventeen billion, one hundred forty-three million, seven hundred seventy-eight thousand, five hundred thirty-one".