22078813 has 2 divisors, whose sum is σ = 22078814. Its totient is φ = 22078812.

The previous prime is 22078807. The next prime is 22078843. The reversal of 22078813 is 31887022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21734244 + 344569 = 4662^2 + 587^2 .

It is a cyclic number.

It is not a de Polignac number, because 22078813 - 2¹⁷ = 21947741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22078843) 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, 11039406 + 11039407.

It is an arithmetic number, because the mean of its divisors is an integer number (11039407).

Almost surely, 2^22078813 is an apocalyptic number.

It is an amenable number.

22078813 is a deficient number, since it is larger than the sum of its proper divisors (1).

22078813 is an equidigital number, since it uses as much as digits as its factorization.

22078813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 22078813 is about 4698.8097429030. The cubic root of 22078813 is about 280.5381360045.

The spelling of 22078813 in words is "twenty-two million, seventy-eight thousand, eight hundred thirteen".