12748581 has 12 divisors (see below), whose sum is σ = 18864300. Its totient is φ = 8291520.

The previous prime is 12748579. The next prime is 12748583. The reversal of 12748581 is 18584721.

12748581 is a `hidden beast` number, since 1 + 2 + 74 + 8 + 581 = 666.

It is an interprime number because it is at equal distance from previous prime (12748579) and next prime (12748583).

It can be written as a sum of positive squares in 2 ways, for example, as 6548481 + 6200100 = 2559^2 + 2490^2 .

It is not a de Polignac number, because 12748581 - 2¹ = 12748579 is a prime.

It is a super-2 number, since 2×12748581² = 325052635027122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12748583) 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, 16906 + ... + 17643.

It is an arithmetic number, because the mean of its divisors is an integer number (1572025).

Almost surely, 2^12748581 is an apocalyptic number.

It is an amenable number.

12748581 is a deficient number, since it is larger than the sum of its proper divisors (6115719).

12748581 is a wasteful number, since it uses less digits than its factorization.

12748581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34596 (or 34593 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The square root of 12748581 is about 3570.5155089987. The cubic root of 12748581 is about 233.6077693845.

The spelling of 12748581 in words is "twelve million, seven hundred forty-eight thousand, five hundred eighty-one".