12563881 has 4 divisors (see below), whose sum is σ = 13706064. Its totient is φ = 11421700.

The previous prime is 12563857. The next prime is 12563927. The reversal of 12563881 is 18836521.

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 an emirpimes, since its reverse is a distinct semiprime: 18836521 = 11 ⋅1712411.

It is a cyclic number.

It is not a de Polignac number, because 12563881 - 2¹⁷ = 12432809 is a prime.

It is a super-2 number, since 2×12563881² = 315702211564322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12563821) 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, 571075 + ... + 571096.

It is an arithmetic number, because the mean of its divisors is an integer number (3426516).

Almost surely, 2^12563881 is an apocalyptic number.

12563881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12563881 is a deficient number, since it is larger than the sum of its proper divisors (1142183).

12563881 is a wasteful number, since it uses less digits than its factorization.

12563881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142182.

The product of its digits is 11520, while the sum is 34.

The square root of 12563881 is about 3544.5565307948. The cubic root of 12563881 is about 232.4741158990.

The spelling of 12563881 in words is "twelve million, five hundred sixty-three thousand, eight hundred eighty-one".