22784261 has 2 divisors, whose sum is σ = 22784262. Its totient is φ = 22784260.

The previous prime is 22784257. The next prime is 22784263. The reversal of 22784261 is 16248722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20205025 + 2579236 = 4495^2 + 1606^2 .

It is a cyclic number.

It is not a de Polignac number, because 22784261 - 2² = 22784257 is a prime.

It is a super-2 number, since 2×22784261² = 1038245098632242, which contains 22 as substring.

Together with 22784263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22784263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11392130 + 11392131.

It is an arithmetic number, because the mean of its divisors is an integer number (11392131).

Almost surely, 2^22784261 is an apocalyptic number.

It is an amenable number.

22784261 is a deficient number, since it is larger than the sum of its proper divisors (1).

22784261 is an equidigital number, since it uses as much as digits as its factorization.

22784261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 32.

The square root of 22784261 is about 4773.2861845902. The cubic root of 22784261 is about 283.4947249676.

The spelling of 22784261 in words is "twenty-two million, seven hundred eighty-four thousand, two hundred sixty-one".