1216539016 has 64 divisors (see below), whose sum is σ = 2869188480. Its totient is φ = 469754880.

The previous prime is 1216539001. The next prime is 1216539017. The reversal of 1216539016 is 6109356121.

It is not an unprimeable number, because it can be changed into a prime (1216539017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60870 + ... + 78346.

It is an arithmetic number, because the mean of its divisors is an integer number (44831070).

Almost surely, 2^1216539016 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216539016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1434594240).

1216539016 is an abundant number, since it is smaller than the sum of its proper divisors (1652649464).

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

1216539016 is a wasteful number, since it uses less digits than its factorization.

1216539016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17614 (or 17610 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 1216539016 is about 34878.9193639941. The cubic root of 1216539016 is about 1067.5183457514.

The spelling of 1216539016 in words is "one billion, two hundred sixteen million, five hundred thirty-nine thousand, sixteen".