12781011 has 16 divisors (see below), whose sum is σ = 17385984. Its totient is φ = 8350464.

The previous prime is 12781009. The next prime is 12781049. The reversal of 12781011 is 11018721.

It is not a de Polignac number, because 12781011 - 2¹ = 12781009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12781081) 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 15 ways as a sum of consecutive naturals, for example, 48466 + ... + 48728.

It is an arithmetic number, because the mean of its divisors is an integer number (1086624).

Almost surely, 2^12781011 is an apocalyptic number.

12781011 is a deficient number, since it is larger than the sum of its proper divisors (4604973).

12781011 is a wasteful number, since it uses less digits than its factorization.

12781011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530.

The product of its (nonzero) digits is 112, while the sum is 21.

The square root of 12781011 is about 3575.0539856064. The cubic root of 12781011 is about 233.8056864477.

Adding to 12781011 its reverse (11018721), we get a palindrome (23799732).

The spelling of 12781011 in words is "twelve million, seven hundred eighty-one thousand, eleven".