1216143633 has 4 divisors (see below), whose sum is σ = 1621524848. Its totient is φ = 810762420.

The previous prime is 1216143631. The next prime is 1216143679. The reversal of 1216143633 is 3363416121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1216143633 - 2¹ = 1216143631 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1216143633.

It is not an unprimeable number, because it can be changed into a prime (1216143631) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 202690603 + ... + 202690608.

It is an arithmetic number, because the mean of its divisors is an integer number (405381212).

Almost surely, 2^1216143633 is an apocalyptic number.

It is an amenable number.

1216143633 is a deficient number, since it is larger than the sum of its proper divisors (405381215).

1216143633 is an equidigital number, since it uses as much as digits as its factorization.

1216143633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405381214.

The product of its digits is 7776, while the sum is 30.

The square root of 1216143633 is about 34873.2509668944. The cubic root of 1216143633 is about 1067.4026831121.

Adding to 1216143633 its reverse (3363416121), we get a palindrome (4579559754).

The spelling of 1216143633 in words is "one billion, two hundred sixteen million, one hundred forty-three thousand, six hundred thirty-three".