318196130521 has 2 divisors, whose sum is σ = 318196130522. Its totient is φ = 318196130520.

The previous prime is 318196130513. The next prime is 318196130587. The reversal of 318196130521 is 125031691813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 318136609296 + 59521225 = 564036^2 + 7715^2 .

It is a cyclic number.

It is not a de Polignac number, because 318196130521 - 2³ = 318196130513 is a prime.

It is not a weakly prime, because it can be changed into another prime (318196130321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159098065260 + 159098065261.

It is an arithmetic number, because the mean of its divisors is an integer number (159098065261).

Almost surely, 2^318196130521 is an apocalyptic number.

It is an amenable number.

318196130521 is a deficient number, since it is larger than the sum of its proper divisors (1).

318196130521 is an equidigital number, since it uses as much as digits as its factorization.

318196130521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 318196130521 in words is "three hundred eighteen billion, one hundred ninety-six million, one hundred thirty thousand, five hundred twenty-one".