1212533616 has 180 divisors, whose sum is σ = 3779923992. Its totient is φ = 333946368.

The previous prime is 1212533599. The next prime is 1212533627. The reversal of 1212533616 is 6163352121.

It is a congruent number.

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 35 ways as a sum of consecutive naturals, for example, 1977726 + ... + 1978338.

Almost surely, 2^1212533616 is an apocalyptic number.

1212533616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212533616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1889961996).

1212533616 is an abundant number, since it is smaller than the sum of its proper divisors (2567390376).

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

1212533616 is a wasteful number, since it uses less digits than its factorization.

1212533616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696 (or 654 counting only the distinct ones).

The product of its digits is 6480, while the sum is 30.

The square root of 1212533616 is about 34821.4533872439. The cubic root of 1212533616 is about 1066.3454722153.

Adding to 1212533616 its reverse (6163352121), we get a palindrome (7375885737).

The spelling of 1212533616 in words is "one billion, two hundred twelve million, five hundred thirty-three thousand, six hundred sixteen".