22840561 has 4 divisors (see below), whose sum is σ = 22867312. Its totient is φ = 22813812.

The previous prime is 22840547. The next prime is 22840591. The reversal of 22840561 is 16504822.

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: 16504822 = 2 ⋅8252411.

It is a cyclic number.

It is not a de Polignac number, because 22840561 - 2²¹ = 20743409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22840511) 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, 12051 + ... + 13816.

It is an arithmetic number, because the mean of its divisors is an integer number (5716828).

Almost surely, 2^22840561 is an apocalyptic number.

It is an amenable number.

22840561 is a deficient number, since it is larger than the sum of its proper divisors (26751).

22840561 is an equidigital number, since it uses as much as digits as its factorization.

22840561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26750.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 22840561 is about 4779.1799505773. The cubic root of 22840561 is about 283.7280384330.

The spelling of 22840561 in words is "twenty-two million, eight hundred forty thousand, five hundred sixty-one".