12787261 has 4 divisors (see below), whose sum is σ = 12794524. Its totient is φ = 12780000.

The previous prime is 12787207. The next prime is 12787267. The reversal of 12787261 is 16278721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 10208025 + 2579236 = 3195^2 + 1606^2 .

It is a cyclic number.

It is not a de Polignac number, because 12787261 - 2¹³ = 12779069 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 (12787267) 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, 871 + ... + 5131.

It is an arithmetic number, because the mean of its divisors is an integer number (3198631).

Almost surely, 2^12787261 is an apocalyptic number.

It is an amenable number.

12787261 is a deficient number, since it is larger than the sum of its proper divisors (7263).

12787261 is an equidigital number, since it uses as much as digits as its factorization.

12787261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7262.

The product of its digits is 9408, while the sum is 34.

The square root of 12787261 is about 3575.9279914450. The cubic root of 12787261 is about 233.8437910862.

The spelling of 12787261 in words is "twelve million, seven hundred eighty-seven thousand, two hundred sixty-one".