22282781 has 2 divisors, whose sum is σ = 22282782. Its totient is φ = 22282780.

The previous prime is 22282727. The next prime is 22282807. The reversal of 22282781 is 18728222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21771556 + 511225 = 4666^2 + 715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22282781 is a prime.

It is a super-2 number, since 2×22282781² = 993044658187922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22282181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11141390 + 11141391.

It is an arithmetic number, because the mean of its divisors is an integer number (11141391).

Almost surely, 2^22282781 is an apocalyptic number.

It is an amenable number.

22282781 is a deficient number, since it is larger than the sum of its proper divisors (1).

22282781 is an equidigital number, since it uses as much as digits as its factorization.

22282781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7168, while the sum is 32.

The square root of 22282781 is about 4720.4640661698. The cubic root of 22282781 is about 281.3993763864.

The spelling of 22282781 in words is "twenty-two million, two hundred eighty-two thousand, seven hundred eighty-one".