22145523 has 4 divisors (see below), whose sum is σ = 29527368. Its totient is φ = 14763680.

The previous prime is 22145521. The next prime is 22145533. The reversal of 22145523 is 32554122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22145523 - 2¹ = 22145521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22145493 and 22145502.

It is not an unprimeable number, because it can be changed into a prime (22145521) 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, 3690918 + ... + 3690923.

It is an arithmetic number, because the mean of its divisors is an integer number (7381842).

Almost surely, 2^22145523 is an apocalyptic number.

22145523 is a deficient number, since it is larger than the sum of its proper divisors (7381845).

22145523 is an equidigital number, since it uses as much as digits as its factorization.

22145523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7381844.

The product of its digits is 2400, while the sum is 24.

The square root of 22145523 is about 4705.9029951753. The cubic root of 22145523 is about 280.8203957759.

Adding to 22145523 its reverse (32554122), we get a palindrome (54699645).

The spelling of 22145523 in words is "twenty-two million, one hundred forty-five thousand, five hundred twenty-three".