22450781 has 2 divisors, whose sum is σ = 22450782. Its totient is φ = 22450780.

The previous prime is 22450777. The next prime is 22450817. The reversal of 22450781 is 18705422.

Together with next prime (22450817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18783556 + 3667225 = 4334^2 + 1915^2 .

It is a cyclic number.

It is not a de Polignac number, because 22450781 - 2² = 22450777 is a prime.

It is a super-2 number, since 2×22450781² = 1008075135019922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22450721) 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 as a sum of consecutive naturals, namely, 11225390 + 11225391.

It is an arithmetic number, because the mean of its divisors is an integer number (11225391).

Almost surely, 2^22450781 is an apocalyptic number.

It is an amenable number.

22450781 is a deficient number, since it is larger than the sum of its proper divisors (1).

22450781 is an equidigital number, since it uses as much as digits as its factorization.

22450781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 22450781 is about 4738.2255117290. The cubic root of 22450781 is about 282.1048057030.

The spelling of 22450781 in words is "twenty-two million, four hundred fifty thousand, seven hundred eighty-one".