12781033 has 4 divisors (see below), whose sum is σ = 12788368. Its totient is φ = 12773700.

The previous prime is 12781009. The next prime is 12781049. The reversal of 12781033 is 33018721.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12781033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12780989 and 12781007.

It is not an unprimeable number, because it can be changed into a prime (12781063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 610 + ... + 5092.

It is an arithmetic number, because the mean of its divisors is an integer number (3197092).

Almost surely, 2^12781033 is an apocalyptic number.

It is an amenable number.

12781033 is a deficient number, since it is larger than the sum of its proper divisors (7335).

12781033 is an equidigital number, since it uses as much as digits as its factorization.

12781033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7334.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 12781033 is about 3575.0570624817. The cubic root of 12781033 is about 233.8058205978.

Adding to 12781033 its reverse (33018721), we get a palindrome (45799754).

The spelling of 12781033 in words is "twelve million, seven hundred eighty-one thousand, thirty-three".