1216231633 has 4 divisors (see below), whose sum is σ = 1233361728. Its totient is φ = 1199101540.

The previous prime is 1216231631. The next prime is 1216231729. The reversal of 1216231633 is 3361326121.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3361326121 = 1499 ⋅2242379.

It is a cyclic number.

It is not a de Polignac number, because 1216231633 - 2¹ = 1216231631 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216231631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8564941 + ... + 8565082.

It is an arithmetic number, because the mean of its divisors is an integer number (308340432).

Almost surely, 2^1216231633 is an apocalyptic number.

It is an amenable number.

1216231633 is a deficient number, since it is larger than the sum of its proper divisors (17130095).

1216231633 is an equidigital number, since it uses as much as digits as its factorization.

1216231633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17130094.

The product of its digits is 3888, while the sum is 28.

The square root of 1216231633 is about 34874.5126560931. The cubic root of 1216231633 is about 1067.4284281990.

Adding to 1216231633 its reverse (3361326121), we get a palindrome (4577557754).

It can be divided in two parts, 121623 and 1633, that added together give a triangular number (123256 = T₄₉₆).

The spelling of 1216231633 in words is "one billion, two hundred sixteen million, two hundred thirty-one thousand, six hundred thirty-three".