1218549319 has 12 divisors (see below), whose sum is σ = 1321388832. Its totient is φ = 1123200000.

The previous prime is 1218549317. The next prime is 1218549331. The reversal of 1218549319 is 9139458121.

It is not a de Polignac number, because 1218549319 - 2¹ = 1218549317 is a prime.

It is a super-2 number, since 2×1218549319² = 2969724885670727522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218549317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 122119 + ... + 131719.

It is an arithmetic number, because the mean of its divisors is an integer number (110115736).

Almost surely, 2^1218549319 is an apocalyptic number.

1218549319 is a deficient number, since it is larger than the sum of its proper divisors (102839513).

1218549319 is an equidigital number, since it uses as much as digits as its factorization.

1218549319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10378 (or 10365 counting only the distinct ones).

The product of its digits is 77760, while the sum is 43.

The square root of 1218549319 is about 34907.7257781139. The cubic root of 1218549319 is about 1068.1060387333.

It can be divided in two parts, 12185 and 49319, that added together give a square (61504 = 248²).

The spelling of 1218549319 in words is "one billion, two hundred eighteen million, five hundred forty-nine thousand, three hundred nineteen".