1216511632 has 60 divisors (see below), whose sum is σ = 2886147120. Its totient is φ = 493915968.

The previous prime is 1216511623. The next prime is 1216511693. The reversal of 1216511632 is 2361156121.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 1216511632.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25938 + ... + 55729.

It is an arithmetic number, because the mean of its divisors is an integer number (48102452).

Almost surely, 2^1216511632 is an apocalyptic number.

It is an amenable number.

1216511632 is an abundant number, since it is smaller than the sum of its proper divisors (1669635488).

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

1216511632 is a wasteful number, since it uses less digits than its factorization.

1216511632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81708 (or 81695 counting only the distinct ones).

The product of its digits is 2160, while the sum is 28.

The square root of 1216511632 is about 34878.5268037513. The cubic root of 1216511632 is about 1067.5103358311.

Adding to 1216511632 its reverse (2361156121), we get a palindrome (3577667753).

The spelling of 1216511632 in words is "one billion, two hundred sixteen million, five hundred eleven thousand, six hundred thirty-two".