22081801 has 6 divisors (see below), whose sum is σ = 25687050. Its totient is φ = 18927216.

The previous prime is 22081777. The next prime is 22081811. The reversal of 22081801 is 10818022.

It can be written as a sum of positive squares in only one way, i.e., 12595401 + 9486400 = 3549^2 + 3080^2 .

It is a de Polignac number, because none of the positive numbers 2^k-22081801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22081811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 225276 + ... + 225373.

It is an arithmetic number, because the mean of its divisors is an integer number (4281175).

Almost surely, 2^22081801 is an apocalyptic number.

It is an amenable number.

22081801 is a deficient number, since it is larger than the sum of its proper divisors (3605249).

22081801 is an equidigital number, since it uses as much as digits as its factorization.

22081801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450663 (or 450656 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 22081801 is about 4699.1276850071. The cubic root of 22081801 is about 280.5507908234.

Adding to 22081801 its reverse (10818022), we get a palindrome (32899823).

The spelling of 22081801 in words is "twenty-two million, eighty-one thousand, eight hundred one".