22227781 has 4 divisors (see below), whose sum is σ = 22769964. Its totient is φ = 21685600.

The previous prime is 22227773. The next prime is 22227797. The reversal of 22227781 is 18772222.

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 688900 + 21538881 = 830^2 + 4641^2 .

It is a cyclic number.

It is not a de Polignac number, because 22227781 - 2³ = 22227773 is a prime.

It is a super-2 number, since 2×22227781² = 988148496367922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22227731) 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, 271030 + ... + 271111.

It is an arithmetic number, because the mean of its divisors is an integer number (5692491).

Almost surely, 2^22227781 is an apocalyptic number.

It is an amenable number.

22227781 is a deficient number, since it is larger than the sum of its proper divisors (542183).

22227781 is an equidigital number, since it uses as much as digits as its factorization.

22227781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542182.

The product of its digits is 6272, while the sum is 31.

The square root of 22227781 is about 4714.6347684630. The cubic root of 22227781 is about 281.1676620867.

The spelling of 22227781 in words is "twenty-two million, two hundred twenty-seven thousand, seven hundred eighty-one".