281525 has 6 divisors (see below), whose sum is σ = 349122. Its totient is φ = 225200.

The previous prime is 281509. The next prime is 281527. The reversal of 281525 is 525182.

It can be written as a sum of positive squares in 3 ways, for example, as 88804 + 192721 = 298^2 + 439^2 .

It is not a de Polignac number, because 281525 - 2⁴ = 281509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 281525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281527) 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, 5606 + ... + 5655.

It is an arithmetic number, because the mean of its divisors is an integer number (58187).

2²⁸¹⁵²⁵ is an apocalyptic number.

281525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

281525 is a deficient number, since it is larger than the sum of its proper divisors (67597).

281525 is a wasteful number, since it uses less digits than its factorization.

281525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11271 (or 11266 counting only the distinct ones).

The product of its digits is 800, while the sum is 23.

The square root of 281525 is about 530.5892950296. The cubic root of 281525 is about 65.5398820883.

The spelling of 281525 in words is "two hundred eighty-one thousand, five hundred twenty-five".