22168681 has 8 divisors (see below), whose sum is σ = 22960584. Its totient is φ = 21390720.

The previous prime is 22168669. The next prime is 22168703. The reversal of 22168681 is 18686122.

It can be written as a sum of positive squares in 4 ways, for example, as 462400 + 21706281 = 680^2 + 4659^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22168681 - 2⁹ = 22168169 is a prime.

It is a super-2 number, since 2×22168681² = 982900834559522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22168621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196 + ... + 6661.

It is an arithmetic number, because the mean of its divisors is an integer number (2870073).

Almost surely, 2^22168681 is an apocalyptic number.

It is an amenable number.

22168681 is a deficient number, since it is larger than the sum of its proper divisors (791903).

22168681 is an equidigital number, since it uses as much as digits as its factorization.

22168681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6971.

The product of its digits is 9216, while the sum is 34.

The square root of 22168681 is about 4708.3628789633. The cubic root of 22168681 is about 280.9182481076.

The spelling of 22168681 in words is "twenty-two million, one hundred sixty-eight thousand, six hundred eighty-one".