22261237 has 8 divisors (see below), whose sum is σ = 22867992. Its totient is φ = 21657600.

The previous prime is 22261207. The next prime is 22261247. The reversal of 22261237 is 73216222.

It can be written as a sum of positive squares in 4 ways, for example, as 5541316 + 16719921 = 2354^2 + 4089^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22261237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22261207) 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, 23187 + ... + 24127.

It is an arithmetic number, because the mean of its divisors is an integer number (2858499).

Almost surely, 2^22261237 is an apocalyptic number.

It is an amenable number.

22261237 is a deficient number, since it is larger than the sum of its proper divisors (606755).

22261237 is an equidigital number, since it uses as much as digits as its factorization.

22261237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1559.

The product of its digits is 2016, while the sum is 25.

The square root of 22261237 is about 4718.1815352951. The cubic root of 22261237 is about 281.3086572636.

Adding to 22261237 its reverse (73216222), we get a palindrome (95477459).

The spelling of 22261237 in words is "twenty-two million, two hundred sixty-one thousand, two hundred thirty-seven".