1243432133 has 4 divisors (see below), whose sum is σ = 1273759788. Its totient is φ = 1213104480.

The previous prime is 1243432123. The next prime is 1243432189. The reversal of 1243432133 is 3312343421.

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 83484769 + 1159947364 = 9137^2 + 34058^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243432133 - 2⁴ = 1243432117 is a prime.

It is a super-2 number, since 2×1243432133² = 3092246938753859378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243432123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15163766 + ... + 15163847.

It is an arithmetic number, because the mean of its divisors is an integer number (318439947).

Almost surely, 2^1243432133 is an apocalyptic number.

It is an amenable number.

1243432133 is a deficient number, since it is larger than the sum of its proper divisors (30327655).

1243432133 is an equidigital number, since it uses as much as digits as its factorization.

1243432133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30327654.

The product of its digits is 5184, while the sum is 26.

The square root of 1243432133 is about 35262.3330623486. Note that the first 3 decimals coincide. The cubic root of 1243432133 is about 1075.3273588928.

Adding to 1243432133 its reverse (3312343421), we get a palindrome (4555775554).

The spelling of 1243432133 in words is "one billion, two hundred forty-three million, four hundred thirty-two thousand, one hundred thirty-three".