22238681 has 2 divisors, whose sum is σ = 22238682. Its totient is φ = 22238680.

The previous prime is 22238663. The next prime is 22238729. The reversal of 22238681 is 18683222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21307456 + 931225 = 4616^2 + 965^2 .

It is a cyclic number.

It is not a de Polignac number, because 22238681 - 2⁶ = 22238617 is a prime.

It is a super-2 number, since 2×22238681² = 989117865239522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22238581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11119340 + 11119341.

It is an arithmetic number, because the mean of its divisors is an integer number (11119341).

Almost surely, 2^22238681 is an apocalyptic number.

It is an amenable number.

22238681 is a deficient number, since it is larger than the sum of its proper divisors (1).

22238681 is an equidigital number, since it uses as much as digits as its factorization.

22238681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 32.

The square root of 22238681 is about 4715.7906017973. The cubic root of 22238681 is about 281.2136139924.

The spelling of 22238681 in words is "twenty-two million, two hundred thirty-eight thousand, six hundred eighty-one".