281493 has 6 divisors (see below), whose sum is σ = 406614. Its totient is φ = 187656.

The previous prime is 281431. The next prime is 281509. The reversal of 281493 is 394182.

It can be written as a sum of positive squares in only one way, i.e., 248004 + 33489 = 498^2 + 183^2 .

It is not a de Polignac number, because 281493 - 2⁶ = 281429 is a prime.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 281493.

It is not an unprimeable number, because it can be changed into a prime (281423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15630 + ... + 15647.

It is an arithmetic number, because the mean of its divisors is an integer number (67769).

2²⁸¹⁴⁹³ is an apocalyptic number.

It is an amenable number.

281493 is a deficient number, since it is larger than the sum of its proper divisors (125121).

281493 is a wasteful number, since it uses less digits than its factorization.

281493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31283 (or 31280 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 281493 is about 530.5591390222. The cubic root of 281493 is about 65.5373987615.

It can be divided in two parts, 28 and 1493, that added together give a square (1521 = 39²).

The spelling of 281493 in words is "two hundred eighty-one thousand, four hundred ninety-three".