1318985639 has 2 divisors, whose sum is σ = 1318985640. Its totient is φ = 1318985638.

The previous prime is 1318985609. The next prime is 1318985671. The reversal of 1318985639 is 9365898131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1318985639 - 2²⁰ = 1317937063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1318985609) 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, 659492819 + 659492820.

It is an arithmetic number, because the mean of its divisors is an integer number (659492820).

Almost surely, 2^1318985639 is an apocalyptic number.

1318985639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1318985639 is an equidigital number, since it uses as much as digits as its factorization.

1318985639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 53.

The square root of 1318985639 is about 36317.8418824687. The cubic root of 1318985639 is about 1096.6802499013.

The spelling of 1318985639 in words is "one billion, three hundred eighteen million, nine hundred eighty-five thousand, six hundred thirty-nine".