1216633 has 4 divisors (see below), whose sum is σ = 1327248. Its totient is φ = 1106020.

The previous prime is 1216619. The next prime is 1216681. The reversal of 1216633 is 3366121.

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: 3366121 = 11 ⋅306011.

It is a cyclic number.

It is not a de Polignac number, because 1216633 - 2⁵ = 1216601 is a prime.

It is a super-3 number, since 3×1216633³ = 5402565377133324411, which contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216603) 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, 55291 + ... + 55312.

It is an arithmetic number, because the mean of its divisors is an integer number (331812).

2^1216633 is an apocalyptic number.

It is an amenable number.

1216633 is a deficient number, since it is larger than the sum of its proper divisors (110615).

1216633 is a wasteful number, since it uses less digits than its factorization.

1216633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110614.

The product of its digits is 648, while the sum is 22.

The square root of 1216633 is about 1103.0108793661. The cubic root of 1216633 is about 106.7545835502.

It can be divided in two parts, 1216 and 633, that added together give a square (1849 = 43²).

The spelling of 1216633 in words is "one million, two hundred sixteen thousand, six hundred thirty-three".