1218133 has 4 divisors (see below), whose sum is σ = 1392160. Its totient is φ = 1044108.

The previous prime is 1218131. The next prime is 1218157. The reversal of 1218133 is 3318121.

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: 3318121 = 601 ⋅5521.

It is a cyclic number.

It is not a de Polignac number, because 1218133 - 2¹ = 1218131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1218133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218131) 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, 87003 + ... + 87016.

It is an arithmetic number, because the mean of its divisors is an integer number (348040).

2^1218133 is an apocalyptic number.

It is an amenable number.

1218133 is a deficient number, since it is larger than the sum of its proper divisors (174027).

1218133 is an equidigital number, since it uses as much as digits as its factorization.

1218133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174026.

The product of its digits is 144, while the sum is 19.

The square root of 1218133 is about 1103.6906269422. The cubic root of 1218133 is about 106.7984384927.

It can be divided in two parts, 12 and 18133, that added together give a triangular number (18145 = T₁₉₀).

The spelling of 1218133 in words is "one million, two hundred eighteen thousand, one hundred thirty-three".