281111225 has 6 divisors (see below), whose sum is σ = 348577950. Its totient is φ = 224888960.

The previous prime is 281111219. The next prime is 281111227. The reversal of 281111225 is 522111182.

It can be written as a sum of positive squares in 3 ways, for example, as 2521744 + 278589481 = 1588^2 + 16691^2 .

It is not a de Polignac number, because 281111225 - 2¹⁶ = 281045689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 281111225.

It is not an unprimeable number, because it can be changed into a prime (281111227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5622200 + ... + 5622249.

It is an arithmetic number, because the mean of its divisors is an integer number (58096325).

Almost surely, 2^281111225 is an apocalyptic number.

281111225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

281111225 is a deficient number, since it is larger than the sum of its proper divisors (67466725).

281111225 is a wasteful number, since it uses less digits than its factorization.

281111225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11244459 (or 11244454 counting only the distinct ones).

The product of its digits is 320, while the sum is 23.

The square root of 281111225 is about 16766.3718496281. The cubic root of 281111225 is about 655.0775698199.

The spelling of 281111225 in words is "two hundred eighty-one million, one hundred eleven thousand, two hundred twenty-five".