12566401 has 4 divisors (see below), whose sum is σ = 12683952. Its totient is φ = 12448852.

The previous prime is 12566369. The next prime is 12566419. The reversal of 12566401 is 10466521.

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.

It is a cyclic number.

It is not a de Polignac number, because 12566401 - 2⁵ = 12566369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12566101) 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, 58615 + ... + 58828.

It is an arithmetic number, because the mean of its divisors is an integer number (3170988).

Almost surely, 2^12566401 is an apocalyptic number.

It is an amenable number.

12566401 is a deficient number, since it is larger than the sum of its proper divisors (117551).

12566401 is a wasteful number, since it uses less digits than its factorization.

12566401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117550.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 12566401 is about 3544.9119876240. The cubic root of 12566401 is about 232.4896576893.

It can be divided in two parts, 1256640 and 1, that added together give a square (1256641 = 1121²).

The spelling of 12566401 in words is "twelve million, five hundred sixty-six thousand, four hundred one".