22312505 has 8 divisors (see below), whose sum is σ = 26971272. Its totient is φ = 17719168.

The previous prime is 22312501. The next prime is 22312547. The reversal of 22312505 is 50521322.

It can be written as a sum of positive squares in 4 ways, for example, as 5776 + 22306729 = 76^2 + 4723^2 .

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 22312505 - 2² = 22312501 is a prime.

It is a super-3 number, since 3×22312505³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22312501) 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 7 ways as a sum of consecutive naturals, for example, 15602 + ... + 16971.

It is an arithmetic number, because the mean of its divisors is an integer number (3371409).

Almost surely, 2^22312505 is an apocalyptic number.

It is an amenable number.

22312505 is a deficient number, since it is larger than the sum of its proper divisors (4658767).

22312505 is a wasteful number, since it uses less digits than its factorization.

22312505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32715.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 22312505 is about 4723.6114361789. The cubic root of 22312505 is about 281.5244445371.

Adding to 22312505 its reverse (50521322), we get a palindrome (72833827).

The spelling of 22312505 in words is "twenty-two million, three hundred twelve thousand, five hundred five".