22451261 has 6 divisors (see below), whose sum is σ = 26116830. Its totient is φ = 19243896.

The previous prime is 22451257. The next prime is 22451269. The reversal of 22451261 is 16215422.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11764900 + 10686361 = 3430^2 + 3269^2 .

It is not a de Polignac number, because 22451261 - 2² = 22451257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22451269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 229046 + ... + 229143.

It is an arithmetic number, because the mean of its divisors is an integer number (4352805).

Almost surely, 2^22451261 is an apocalyptic number.

It is an amenable number.

22451261 is a deficient number, since it is larger than the sum of its proper divisors (3665569).

22451261 is an equidigital number, since it uses as much as digits as its factorization.

22451261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458203 (or 458196 counting only the distinct ones).

The product of its digits is 960, while the sum is 23.

The square root of 22451261 is about 4738.2761633320. The cubic root of 22451261 is about 282.1068161653.

Adding to 22451261 its reverse (16215422), we get a palindrome (38666683).

The spelling of 22451261 in words is "twenty-two million, four hundred fifty-one thousand, two hundred sixty-one".