122281 has 4 divisors (see below), whose sum is σ = 129492. Its totient is φ = 115072.

The previous prime is 122279. The next prime is 122299. The reversal of 122281 is 182221.

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 46656 + 75625 = 216^2 + 275^2 .

It is a cyclic number.

It is not a de Polignac number, because 122281 - 2¹ = 122279 is a prime.

It is a super-2 number, since 2×122281² = 29905285922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3580 + ... + 3613.

It is an arithmetic number, because the mean of its divisors is an integer number (32373).

2¹²²²⁸¹ is an apocalyptic number.

It is an amenable number.

122281 is a deficient number, since it is larger than the sum of its proper divisors (7211).

122281 is an equidigital number, since it uses as much as digits as its factorization.

122281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7210.

The product of its digits is 64, while the sum is 16.

The square root of 122281 is about 349.6870029040. The cubic root of 122281 is about 49.6348058249.

Subtracting from 122281 its sum of digits (16), we obtain a triangular number (122265 = T₄₉₄).

It can be divided in two parts, 12 and 2281, that multiplied together give a palindrome (27372).

The spelling of 122281 in words is "one hundred twenty-two thousand, two hundred eighty-one".