22331561 has 8 divisors (see below), whose sum is σ = 25552320. Its totient is φ = 19118448.

The previous prime is 22331549. The next prime is 22331567. The reversal of 22331561 is 16513322.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22331561 - 2²² = 18137257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22331567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7370 + ... + 9948.

It is an arithmetic number, because the mean of its divisors is an integer number (3194040).

Almost surely, 2^22331561 is an apocalyptic number.

It is an amenable number.

22331561 is a deficient number, since it is larger than the sum of its proper divisors (3220759).

22331561 is a wasteful number, since it uses less digits than its factorization.

22331561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3823.

The product of its digits is 1080, while the sum is 23.

The square root of 22331561 is about 4725.6281064002. The cubic root of 22331561 is about 281.6045670707.

Adding to 22331561 its reverse (16513322), we get a palindrome (38844883).

The spelling of 22331561 in words is "twenty-two million, three hundred thirty-one thousand, five hundred sixty-one".