12887569 has 4 divisors (see below), whose sum is σ = 12896820. Its totient is φ = 12878320.

The previous prime is 12887551. The next prime is 12887587. The reversal of 12887569 is 96578821.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 96578821 = 41 ⋅2355581.

It is an interprime number because it is at equal distance from previous prime (12887551) and next prime (12887587).

It can be written as a sum of positive squares in 2 ways, for example, as 1918225 + 10969344 = 1385^2 + 3312^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12887569 is a prime.

It is a super-2 number, since 2×12887569² = 332178869459522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12887509) 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, 2062 + ... + 5479.

It is an arithmetic number, because the mean of its divisors is an integer number (3224205).

Almost surely, 2^12887569 is an apocalyptic number.

It is an amenable number.

12887569 is a deficient number, since it is larger than the sum of its proper divisors (9251).

12887569 is an equidigital number, since it uses as much as digits as its factorization.

12887569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9250.

The product of its digits is 241920, while the sum is 46.

The square root of 12887569 is about 3589.9260438065. The cubic root of 12887569 is about 234.4536515646.

It can be divided in two parts, 12887 and 569, that added together give a square (13456 = 116²).

The spelling of 12887569 in words is "twelve million, eight hundred eighty-seven thousand, five hundred sixty-nine".