1218541456 has 40 divisors (see below), whose sum is σ = 2578299264. Its totient is φ = 553292160.

The previous prime is 1218541447. The next prime is 1218541463. The reversal of 1218541456 is 6541458121.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 190990 + ... + 197266.

Almost surely, 2^1218541456 is an apocalyptic number.

1218541456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1218541456 is an abundant number, since it is smaller than the sum of its proper divisors (1359757808).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1218541456 is a wasteful number, since it uses less digits than its factorization.

1218541456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7399 (or 7393 counting only the distinct ones).

The product of its digits is 38400, while the sum is 37.

The square root of 1218541456 is about 34907.6131524342. The cubic root of 1218541456 is about 1068.1037413195.

Adding to 1218541456 its reverse (6541458121), we get a palindrome (7759999577).

The spelling of 1218541456 in words is "one billion, two hundred eighteen million, five hundred forty-one thousand, four hundred fifty-six".