22081777 has 2 divisors, whose sum is σ = 22081778. Its totient is φ = 22081776.

The previous prime is 22081757. The next prime is 22081811. The reversal of 22081777 is 77718022.

It is an a-pointer prime, because the next prime (22081811) can be obtained adding 22081777 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19722481 + 2359296 = 4441^2 + 1536^2 .

It is a cyclic number.

It is not a de Polignac number, because 22081777 - 2⁷ = 22081649 is a prime.

It is not a weakly prime, because it can be changed into another prime (22081757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11040888 + 11040889.

It is an arithmetic number, because the mean of its divisors is an integer number (11040889).

Almost surely, 2^22081777 is an apocalyptic number.

It is an amenable number.

22081777 is a deficient number, since it is larger than the sum of its proper divisors (1).

22081777 is an equidigital number, since it uses as much as digits as its factorization.

22081777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10976, while the sum is 34.

The square root of 22081777 is about 4699.1251313409. The cubic root of 22081777 is about 280.5506891828.

Adding to 22081777 its reverse (77718022), we get a palindrome (99799799).

The spelling of 22081777 in words is "twenty-two million, eighty-one thousand, seven hundred seventy-seven".