22505261 has 4 divisors (see below), whose sum is σ = 22737372. Its totient is φ = 22273152.

The previous prime is 22505251. The next prime is 22505317. The reversal of 22505261 is 16250522.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13920361 + 8584900 = 3731^2 + 2930^2 .

It is a cyclic number.

It is not a de Polignac number, because 22505261 - 2¹⁴ = 22488877 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 (22505251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115910 + ... + 116103.

It is an arithmetic number, because the mean of its divisors is an integer number (5684343).

Almost surely, 2^22505261 is an apocalyptic number.

It is an amenable number.

22505261 is a deficient number, since it is larger than the sum of its proper divisors (232111).

22505261 is an equidigital number, since it uses as much as digits as its factorization.

22505261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232110.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 22505261 is about 4743.9710159317. The cubic root of 22505261 is about 282.3328104631.

Adding to 22505261 its reverse (16250522), we get a palindrome (38755783).

The spelling of 22505261 in words is "twenty-two million, five hundred five thousand, two hundred sixty-one".