1216533 has 16 divisors (see below), whose sum is σ = 1703936. Its totient is φ = 771120.

The previous prime is 1216529. The next prime is 1216543. The reversal of 1216533 is 3356121.

It is not a de Polignac number, because 1216533 - 2² = 1216529 is a prime.

It is a super-3 number, since 3×1216533³ = 5401233310356274311, which contains 333 as substring.

It is a Smith number, since the sum of its digits (21) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9516 + ... + 9642.

It is an arithmetic number, because the mean of its divisors is an integer number (106496).

2^1216533 is an apocalyptic number.

It is an amenable number.

1216533 is a deficient number, since it is larger than the sum of its proper divisors (487403).

1216533 is a wasteful number, since it uses less digits than its factorization.

1216533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264.

The product of its digits is 540, while the sum is 21.

The square root of 1216533 is about 1102.9655479660. The cubic root of 1216533 is about 106.7516586060.

The spelling of 1216533 in words is "one million, two hundred sixteen thousand, five hundred thirty-three".