12621563 has 4 divisors (see below), whose sum is σ = 12929448. Its totient is φ = 12313680.

The previous prime is 12621547. The next prime is 12621569. The reversal of 12621563 is 36512621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12621563 - 2⁴ = 12621547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12621569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153881 + ... + 153962.

It is an arithmetic number, because the mean of its divisors is an integer number (3232362).

Almost surely, 2^12621563 is an apocalyptic number.

12621563 is a deficient number, since it is larger than the sum of its proper divisors (307885).

12621563 is an equidigital number, since it uses as much as digits as its factorization.

12621563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307884.

The product of its digits is 2160, while the sum is 26.

The square root of 12621563 is about 3552.6839150141. The cubic root of 12621563 is about 232.8293432524.

The spelling of 12621563 in words is "twelve million, six hundred twenty-one thousand, five hundred sixty-three".