12862561 has 4 divisors (see below), whose sum is σ = 13176324. Its totient is φ = 12548800.

The previous prime is 12862511. The next prime is 12862567. The reversal of 12862561 is 16526821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16526821 = 167 ⋅98963.

It can be written as a sum of positive squares in 2 ways, for example, as 7595536 + 5267025 = 2756^2 + 2295^2 .

It is a cyclic number.

It is not a de Polignac number, because 12862561 - 2⁹ = 12862049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12862567) 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, 156820 + ... + 156901.

It is an arithmetic number, because the mean of its divisors is an integer number (3294081).

Almost surely, 2^12862561 is an apocalyptic number.

It is an amenable number.

12862561 is a deficient number, since it is larger than the sum of its proper divisors (313763).

12862561 is an equidigital number, since it uses as much as digits as its factorization.

12862561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313762.

The product of its digits is 5760, while the sum is 31.

The square root of 12862561 is about 3586.4412723478. The cubic root of 12862561 is about 234.3019029174.

The spelling of 12862561 in words is "twelve million, eight hundred sixty-two thousand, five hundred sixty-one".