318540521639 has 2 divisors, whose sum is σ = 318540521640. Its totient is φ = 318540521638.

The previous prime is 318540521599. The next prime is 318540521653. The reversal of 318540521639 is 936125045813.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 318540521639 - 2¹⁶ = 318540456103 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 318540521593 and 318540521602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (318540521659) 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, 159270260819 + 159270260820.

It is an arithmetic number, because the mean of its divisors is an integer number (159270260820).

Almost surely, 2^318540521639 is an apocalyptic number.

318540521639 is a deficient number, since it is larger than the sum of its proper divisors (1).

318540521639 is an equidigital number, since it uses as much as digits as its factorization.

318540521639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 777600, while the sum is 47.

The spelling of 318540521639 in words is "three hundred eighteen billion, five hundred forty million, five hundred twenty-one thousand, six hundred thirty-nine".