281984245 has 4 divisors (see below), whose sum is σ = 338381100. Its totient is φ = 225587392.

The previous prime is 281984243. The next prime is 281984251. The reversal of 281984245 is 542489182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 542489182 = 2 ⋅271244591.

It can be written as a sum of positive squares in 2 ways, for example, as 217326564 + 64657681 = 14742^2 + 8041^2 .

It is a cyclic number.

It is not a de Polignac number, because 281984245 - 2¹ = 281984243 is a prime.

It is a super-2 number, since 2×281984245² = 159030228856440050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281984243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28198420 + ... + 28198429.

It is an arithmetic number, because the mean of its divisors is an integer number (84595275).

Almost surely, 2^281984245 is an apocalyptic number.

It is an amenable number.

281984245 is a deficient number, since it is larger than the sum of its proper divisors (56396855).

281984245 is an equidigital number, since it uses as much as digits as its factorization.

281984245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56396854.

The product of its digits is 184320, while the sum is 43.

The square root of 281984245 is about 16792.3865188960. The cubic root of 281984245 is about 655.7550060816.

The spelling of 281984245 in words is "two hundred eighty-one million, nine hundred eighty-four thousand, two hundred forty-five".