1216306144 has 24 divisors (see below), whose sum is σ = 2427410160. Its totient is φ = 599821056.

The previous prime is 1216306121. The next prime is 1216306151. The reversal of 1216306144 is 4416036121.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 258004 + ... + 262675.

It is an arithmetic number, because the mean of its divisors is an integer number (101142090).

Almost surely, 2^1216306144 is an apocalyptic number.

It is an amenable number.

1216306144 is a deficient number, since it is larger than the sum of its proper divisors (1211104016).

1216306144 is an equidigital number, since it uses as much as digits as its factorization.

1216306144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520762 (or 520754 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1216306144 is about 34875.5809127246. The cubic root of 1216306144 is about 1067.4502260028.

The spelling of 1216306144 in words is "one billion, two hundred sixteen million, three hundred six thousand, one hundred forty-four".