22773281 has 2 divisors, whose sum is σ = 22773282. Its totient is φ = 22773280.

The previous prime is 22773277. The next prime is 22773307. The reversal of 22773281 is 18237722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16443025 + 6330256 = 4055^2 + 2516^2 .

It is a cyclic number.

It is not a de Polignac number, because 22773281 - 2² = 22773277 is a prime.

It is a super-2 number, since 2×22773281² = 1037244655009922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22773221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11386640 + 11386641.

It is an arithmetic number, because the mean of its divisors is an integer number (11386641).

Almost surely, 2^22773281 is an apocalyptic number.

It is an amenable number.

22773281 is a deficient number, since it is larger than the sum of its proper divisors (1).

22773281 is an equidigital number, since it uses as much as digits as its factorization.

22773281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9408, while the sum is 32.

The square root of 22773281 is about 4772.1358949636. The cubic root of 22773281 is about 283.4491778501.

The spelling of 22773281 in words is "twenty-two million, seven hundred seventy-three thousand, two hundred eighty-one".