2281561 has 4 divisors (see below), whose sum is σ = 2302992. Its totient is φ = 2260132.

The previous prime is 2281529. The next prime is 2281567. The reversal of 2281561 is 1651822.

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 2281561 - 2⁵ = 2281529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2281567) 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, 10555 + ... + 10768.

It is an arithmetic number, because the mean of its divisors is an integer number (575748).

2^2281561 is an apocalyptic number.

It is an amenable number.

2281561 is a deficient number, since it is larger than the sum of its proper divisors (21431).

2281561 is a wasteful number, since it uses less digits than its factorization.

2281561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21430.

The product of its digits is 960, while the sum is 25.

The square root of 2281561 is about 1510.4836973632. The cubic root of 2281561 is about 131.6469175813.

The spelling of 2281561 in words is "two million, two hundred eighty-one thousand, five hundred sixty-one".