12947581 has 4 divisors (see below), whose sum is σ = 12955072. Its totient is φ = 12940092.

The previous prime is 12947573. The next prime is 12947587. The reversal of 12947581 is 18574921.

12947581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18574921 = 31 ⋅599191.

It is a cyclic number.

It is not a de Polignac number, because 12947581 - 2³ = 12947573 is a prime.

It is a super-2 number, since 2×12947581² = 335279707503122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12947581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12947587) 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, 316 + ... + 5098.

It is an arithmetic number, because the mean of its divisors is an integer number (3238768).

Almost surely, 2^12947581 is an apocalyptic number.

It is an amenable number.

12947581 is a deficient number, since it is larger than the sum of its proper divisors (7491).

12947581 is an equidigital number, since it uses as much as digits as its factorization.

12947581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7490.

The product of its digits is 20160, while the sum is 37.

The square root of 12947581 is about 3598.2747254761. The cubic root of 12947581 is about 234.8170055701.

The spelling of 12947581 in words is "twelve million, nine hundred forty-seven thousand, five hundred eighty-one".