22276781 has 2 divisors, whose sum is σ = 22276782. Its totient is φ = 22276780.

The previous prime is 22276769. The next prime is 22276799. The reversal of 22276781 is 18767222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14182756 + 8094025 = 3766^2 + 2845^2 .

It is a cyclic number.

It is not a de Polignac number, because 22276781 - 2⁶ = 22276717 is a prime.

It is a super-2 number, since 2×22276781² = 992509943443922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22276741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11138390 + 11138391.

It is an arithmetic number, because the mean of its divisors is an integer number (11138391).

Almost surely, 2^22276781 is an apocalyptic number.

It is an amenable number.

22276781 is a deficient number, since it is larger than the sum of its proper divisors (1).

22276781 is an equidigital number, since it uses as much as digits as its factorization.

22276781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18816, while the sum is 35.

The square root of 22276781 is about 4719.8284926467. The cubic root of 22276781 is about 281.3741170045.

The spelling of 22276781 in words is "twenty-two million, two hundred seventy-six thousand, seven hundred eighty-one".