22812281 has 8 divisors (see below), whose sum is σ = 23303784. Its totient is φ = 22325760.

The previous prime is 22812269. The next prime is 22812287. The reversal of 22812281 is 18221822.

It can be written as a sum of positive squares in 4 ways, for example, as 5664400 + 17147881 = 2380^2 + 4141^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22812281 is a prime.

It is a super-2 number, since 2×22812281² = 1040800328845922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 22812281.

It is not an unprimeable number, because it can be changed into a prime (22812287) 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, 8861 + ... + 11141.

It is an arithmetic number, because the mean of its divisors is an integer number (2912973).

Almost surely, 2^22812281 is an apocalyptic number.

It is an amenable number.

22812281 is a deficient number, since it is larger than the sum of its proper divisors (491503).

22812281 is a wasteful number, since it uses less digits than its factorization.

22812281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2491.

The product of its digits is 1024, while the sum is 26.

The square root of 22812281 is about 4776.2203676129. The cubic root of 22812281 is about 283.6108909489.

The spelling of 22812281 in words is "twenty-two million, eight hundred twelve thousand, two hundred eighty-one".