22405261 has 2 divisors, whose sum is σ = 22405262. Its totient is φ = 22405260.

The previous prime is 22405249. The next prime is 22405267. The reversal of 22405261 is 16250422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16859236 + 5546025 = 4106^2 + 2355^2 .

It is a cyclic number.

It is not a de Polignac number, because 22405261 - 2¹³ = 22397069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22405267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11202630 + 11202631.

It is an arithmetic number, because the mean of its divisors is an integer number (11202631).

Almost surely, 2^22405261 is an apocalyptic number.

It is an amenable number.

22405261 is a deficient number, since it is larger than the sum of its proper divisors (1).

22405261 is an equidigital number, since it uses as much as digits as its factorization.

22405261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 22405261 is about 4733.4195884160. The cubic root of 22405261 is about 281.9140165066.

Adding to 22405261 its reverse (16250422), we get a palindrome (38655683).

The spelling of 22405261 in words is "twenty-two million, four hundred five thousand, two hundred sixty-one".