12816761 has 4 divisors (see below), whose sum is σ = 12910452. Its totient is φ = 12723072.

The previous prime is 12816751. The next prime is 12816821. The reversal of 12816761 is 16761821.

It is a happy number.

12816761 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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 7595536 + 5221225 = 2756^2 + 2285^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12816761 is a prime.

It is a super-2 number, since 2×12816761² = 328538725062242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12816731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46640 + ... + 46913.

It is an arithmetic number, because the mean of its divisors is an integer number (3227613).

Almost surely, 2^12816761 is an apocalyptic number.

It is an amenable number.

12816761 is a deficient number, since it is larger than the sum of its proper divisors (93691).

12816761 is an equidigital number, since it uses as much as digits as its factorization.

12816761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93690.

The product of its digits is 4032, while the sum is 32.

The square root of 12816761 is about 3580.0504186394. The cubic root of 12816761 is about 234.0234775674.

It can be divided in two parts, 128167 and 61, that multiplied together give a palindrome (7818187).

The spelling of 12816761 in words is "twelve million, eight hundred sixteen thousand, seven hundred sixty-one".