1243533133 has 4 divisors (see below), whose sum is σ = 1246405468. Its totient is φ = 1240660800.

The previous prime is 1243533091. The next prime is 1243533167. The reversal of 1243533133 is 3313353421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 76422564 + 1167110569 = 8742^2 + 34163^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243533133 - 2¹³ = 1243524941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243503133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1435518 + ... + 1436383.

It is an arithmetic number, because the mean of its divisors is an integer number (311601367).

Almost surely, 2^1243533133 is an apocalyptic number.

It is an amenable number.

1243533133 is a deficient number, since it is larger than the sum of its proper divisors (2872335).

1243533133 is an equidigital number, since it uses as much as digits as its factorization.

1243533133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2872334.

The product of its digits is 9720, while the sum is 28.

The square root of 1243533133 is about 35263.7651563187. The cubic root of 1243533133 is about 1075.3564732342.

Adding to 1243533133 its reverse (3313353421), we get a palindrome (4556886554).

The spelling of 1243533133 in words is "one billion, two hundred forty-three million, five hundred thirty-three thousand, one hundred thirty-three".