2236561 has 4 divisors (see below), whose sum is σ = 2248000. Its totient is φ = 2225124.

The previous prime is 2236519. The next prime is 2236573. The reversal of 2236561 is 1656322.

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 2236561 - 2⁹ = 2236049 is a prime.

It is a d-powerful number, because it can be written as 2 + 2¹⁷ + 3¹⁰ + 6⁶ + 5⁹ + 6⁶ + 1 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2236511) 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, 5421 + ... + 5818.

It is an arithmetic number, because the mean of its divisors is an integer number (562000).

2^2236561 is an apocalyptic number.

It is an amenable number.

2236561 is a deficient number, since it is larger than the sum of its proper divisors (11439).

2236561 is a wasteful number, since it uses less digits than its factorization.

2236561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11438.

The product of its digits is 2160, while the sum is 25.

The square root of 2236561 is about 1495.5136241439. The cubic root of 2236561 is about 130.7756586052.

The spelling of 2236561 in words is "two million, two hundred thirty-six thousand, five hundred sixty-one".