281245 has 4 divisors (see below), whose sum is σ = 337500. Its totient is φ = 224992.

The previous prime is 281243. The next prime is 281249. The reversal of 281245 is 542182.

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 191844 + 89401 = 438^2 + 299^2 .

It is a cyclic number.

It is not a de Polignac number, because 281245 - 2¹ = 281243 is a prime.

281245 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281243) 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, 28120 + ... + 28129.

It is an arithmetic number, because the mean of its divisors is an integer number (84375).

2²⁸¹²⁴⁵ is an apocalyptic number.

It is an amenable number.

281245 is a deficient number, since it is larger than the sum of its proper divisors (56255).

281245 is an equidigital number, since it uses as much as digits as its factorization.

281245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56254.

The product of its digits is 640, while the sum is 22.

The square root of 281245 is about 530.3253718238. The cubic root of 281245 is about 65.5181465949.

The spelling of 281245 in words is "two hundred eighty-one thousand, two hundred forty-five".