222278281 has 9 divisors (see below), whose sum is σ = 236392149. Its totient is φ = 208964544.

The previous prime is 222278267. The next prime is 222278291. The reversal of 222278281 is 182872222.

The square root of 222278281 is 14909.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 86322681 + 135955600 = 9291^2 + 11660^2 .

It is not a de Polignac number, because 222278281 - 2⁵ = 222278249 is a prime.

It is a super-2 number, since 2×222278281² = 98815268408629922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222278201) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 253015 + ... + 253891.

Almost surely, 2^222278281 is an apocalyptic number.

222278281 is the 14909-th square number.

222278281 is the 7455-th centered octagonal number.

It is an amenable number.

222278281 is a deficient number, since it is larger than the sum of its proper divisors (14113868).

222278281 is an frugal number, since it uses more digits than its factorization.

222278281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1788 (or 894 counting only the distinct ones).

The product of its digits is 14336, while the sum is 34.

The cubic root of 222278281 is about 605.7577927749.

The spelling of 222278281 in words is "two hundred twenty-two million, two hundred seventy-eight thousand, two hundred eighty-one".