22050781 has 2 divisors, whose sum is σ = 22050782. Its totient is φ = 22050780.

The previous prime is 22050761. The next prime is 22050863. The reversal of 22050781 is 18705022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14182756 + 7868025 = 3766^2 + 2805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22050781 is a prime.

It is a super-2 number, since 2×22050781² = 972473885419922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22050761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11025390 + 11025391.

It is an arithmetic number, because the mean of its divisors is an integer number (11025391).

Almost surely, 2^22050781 is an apocalyptic number.

It is an amenable number.

22050781 is a deficient number, since it is larger than the sum of its proper divisors (1).

22050781 is an equidigital number, since it uses as much as digits as its factorization.

22050781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 22050781 is about 4695.8259124461. The cubic root of 22050781 is about 280.4193588533.

The spelling of 22050781 in words is "twenty-two million, fifty thousand, seven hundred eighty-one".