22686481 has 2 divisors, whose sum is σ = 22686482. Its totient is φ = 22686480.

The previous prime is 22686431. The next prime is 22686493. The reversal of 22686481 is 18468622.

It is the 1945-th star number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22420225 + 266256 = 4735^2 + 516^2 .

It is a cyclic number.

It is not a de Polignac number, because 22686481 - 2⁷ = 22686353 is a prime.

It is a super-2 number, since 2×22686481² = 1029352840326722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22686481.

It is not a weakly prime, because it can be changed into another prime (22686421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11343240 + 11343241.

It is an arithmetic number, because the mean of its divisors is an integer number (11343241).

Almost surely, 2^22686481 is an apocalyptic number.

It is an amenable number.

22686481 is a deficient number, since it is larger than the sum of its proper divisors (1).

22686481 is an equidigital number, since it uses as much as digits as its factorization.

22686481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36864, while the sum is 37.

The square root of 22686481 is about 4763.0327523543. The cubic root of 22686481 is about 283.0885986627.

The spelling of 22686481 in words is "twenty-two million, six hundred eighty-six thousand, four hundred eighty-one".