3563621 has 4 divisors (see below), whose sum is σ = 3751200. Its totient is φ = 3376044.

The previous prime is 3563569. The next prime is 3563653. The reversal of 3563621 is 1263653.

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: 1263653 = 31 ⋅40763.

It is a cyclic number.

It is not a de Polignac number, because 3563621 - 2¹⁸ = 3301477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3563671) 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, 93761 + ... + 93798.

It is an arithmetic number, because the mean of its divisors is an integer number (937800).

Almost surely, 2^3563621 is an apocalyptic number.

It is an amenable number.

3563621 is a deficient number, since it is larger than the sum of its proper divisors (187579).

3563621 is a wasteful number, since it uses less digits than its factorization.

3563621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187578.

The product of its digits is 3240, while the sum is 26.

The square root of 3563621 is about 1887.7555456150. The cubic root of 3563621 is about 152.7438863837.

Subtracting from 3563621 its reverse (1263653), we obtain a cube (2299968 = 132³).

The spelling of 3563621 in words is "three million, five hundred sixty-three thousand, six hundred twenty-one".