318172536497 has 2 divisors, whose sum is σ = 318172536498. Its totient is φ = 318172536496.

The previous prime is 318172536467. The next prime is 318172536523. The reversal of 318172536497 is 794635271813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216742389136 + 101430147361 = 465556^2 + 318481^2 .

It is a cyclic number.

It is not a de Polignac number, because 318172536497 - 2²⁸ = 317904101041 is a prime.

It is not a weakly prime, because it can be changed into another prime (318172536427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159086268248 + 159086268249.

It is an arithmetic number, because the mean of its divisors is an integer number (159086268249).

Almost surely, 2^318172536497 is an apocalyptic number.

It is an amenable number.

318172536497 is a deficient number, since it is larger than the sum of its proper divisors (1).

318172536497 is an equidigital number, since it uses as much as digits as its factorization.

318172536497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7620480, while the sum is 56.

The spelling of 318172536497 in words is "three hundred eighteen billion, one hundred seventy-two million, five hundred thirty-six thousand, four hundred ninety-seven".