1213533 has 6 divisors (see below), whose sum is σ = 1752894. Its totient is φ = 809016.

The previous prime is 1213529. The next prime is 1213547. The reversal of 1213533 is 3353121.

It can be written as a sum of positive squares in only one way, i.e., 956484 + 257049 = 978^2 + 507^2 .

It is not a de Polignac number, because 1213533 - 2² = 1213529 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213573) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67410 + ... + 67427.

It is an arithmetic number, because the mean of its divisors is an integer number (292149).

2^1213533 is an apocalyptic number.

It is an amenable number.

1213533 is a deficient number, since it is larger than the sum of its proper divisors (539361).

1213533 is a wasteful number, since it uses less digits than its factorization.

1213533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134843 (or 134840 counting only the distinct ones).

The product of its digits is 270, while the sum is 18.

The square root of 1213533 is about 1101.6047385519. The cubic root of 1213533 is about 106.6638356453.

Adding to 1213533 its reverse (3353121), we get a palindrome (4566654).

The spelling of 1213533 in words is "one million, two hundred thirteen thousand, five hundred thirty-three".