1216537152 has 112 divisors (see below), whose sum is σ = 3292717824. Its totient is φ = 396288000.

The previous prime is 1216537141. The next prime is 1216537277. The reversal of 1216537152 is 2517356121.

It is a super-2 number, since 2×1216537152² = 2959925284392542208, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2822377 + ... + 2822807.

Almost surely, 2^1216537152 is an apocalyptic number.

1216537152 is a gapful number since it is divisible by the number (12) 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 1216537152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1646358912).

1216537152 is an abundant number, since it is smaller than the sum of its proper divisors (2076180672).

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

1216537152 is a wasteful number, since it uses less digits than its factorization.

1216537152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748 (or 738 counting only the distinct ones).

The product of its digits is 12600, while the sum is 33.

The square root of 1216537152 is about 34878.8926429725. The cubic root of 1216537152 is about 1067.5178005284.

The spelling of 1216537152 in words is "one billion, two hundred sixteen million, five hundred thirty-seven thousand, one hundred fifty-two".