1318555489 has 2 divisors, whose sum is σ = 1318555490. Its totient is φ = 1318555488.

The previous prime is 1318555471. The next prime is 1318555501. The reversal of 1318555489 is 9845558131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 779526400 + 539029089 = 27920^2 + 23217^2 .

It is a cyclic number.

It is not a de Polignac number, because 1318555489 - 2¹³ = 1318547297 is a prime.

It is not a weakly prime, because it can be changed into another prime (1318550489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659277744 + 659277745.

It is an arithmetic number, because the mean of its divisors is an integer number (659277745).

Almost surely, 2^1318555489 is an apocalyptic number.

It is an amenable number.

1318555489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1318555489 is an equidigital number, since it uses as much as digits as its factorization.

1318555489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864000, while the sum is 49.

The square root of 1318555489 is about 36311.9193791791. The cubic root of 1318555489 is about 1096.5610198187.

The spelling of 1318555489 in words is "one billion, three hundred eighteen million, five hundred fifty-five thousand, four hundred eighty-nine".