22561723 has 4 divisors (see below), whose sum is σ = 22571248. Its totient is φ = 22552200.

The previous prime is 22561687. The next prime is 22561727. The reversal of 22561723 is 32716522.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 22561723 - 2¹⁷ = 22430651 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22561691 and 22561700.

It is not an unprimeable number, because it can be changed into a prime (22561727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1873 + ... + 6973.

It is an arithmetic number, because the mean of its divisors is an integer number (5642812).

Almost surely, 2^22561723 is an apocalyptic number.

22561723 is a deficient number, since it is larger than the sum of its proper divisors (9525).

22561723 is an equidigital number, since it uses as much as digits as its factorization.

22561723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9524.

The product of its digits is 5040, while the sum is 28.

The square root of 22561723 is about 4749.9182098221. The cubic root of 22561723 is about 282.5687221538.

It can be divided in two parts, 22 and 561723, that multiplied together give a triangular number (12357906 = T₄₉₇₁).

The spelling of 22561723 in words is "twenty-two million, five hundred sixty-one thousand, seven hundred twenty-three".