22638881 has 2 divisors, whose sum is σ = 22638882. Its totient is φ = 22638880.

The previous prime is 22638871. The next prime is 22638919. The reversal of 22638881 is 18883622.

It is an a-pointer prime, because the next prime (22638919) can be obtained adding 22638881 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17977600 + 4661281 = 4240^2 + 2159^2 .

It is a cyclic number.

It is not a de Polignac number, because 22638881 - 2¹⁴ = 22622497 is a prime.

It is a super-2 number, since 2×22638881² = 1025037865864322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22638871) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11319440 + 11319441.

It is an arithmetic number, because the mean of its divisors is an integer number (11319441).

Almost surely, 2^22638881 is an apocalyptic number.

It is an amenable number.

22638881 is a deficient number, since it is larger than the sum of its proper divisors (1).

22638881 is an equidigital number, since it uses as much as digits as its factorization.

22638881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36864, while the sum is 38.

The square root of 22638881 is about 4758.0333121995. The cubic root of 22638881 is about 282.8904710851.

The spelling of 22638881 in words is "twenty-two million, six hundred thirty-eight thousand, eight hundred eighty-one".