12816261 has 12 divisors (see below), whose sum is σ = 18558540. Its totient is φ = 8522880.

The previous prime is 12816259. The next prime is 12816269. The reversal of 12816261 is 16261821.

12816261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 8381025 + 4435236 = 2895^2 + 2106^2 .

It is not a de Polignac number, because 12816261 - 2¹ = 12816259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12816269) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2605 + ... + 5693.

It is an arithmetic number, because the mean of its divisors is an integer number (1546545).

Almost surely, 2^12816261 is an apocalyptic number.

It is an amenable number.

12816261 is a deficient number, since it is larger than the sum of its proper divisors (5742279).

12816261 is a wasteful number, since it uses less digits than its factorization.

12816261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3556 (or 3553 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 12816261 is about 3579.9805865395. The cubic root of 12816261 is about 234.0204343321.

The spelling of 12816261 in words is "twelve million, eight hundred sixteen thousand, two hundred sixty-one".