285261 has 4 divisors (see below), whose sum is σ = 380352. Its totient is φ = 190172.

The previous prime is 285251. The next prime is 285281. The reversal of 285261 is 162582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 285261 - 2⁹ = 284749 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285221) 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, 47541 + ... + 47546.

It is an arithmetic number, because the mean of its divisors is an integer number (95088).

2²⁸⁵²⁶¹ is an apocalyptic number.

It is an amenable number.

285261 is a deficient number, since it is larger than the sum of its proper divisors (95091).

285261 is an equidigital number, since it uses as much as digits as its factorization.

285261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95090.

The product of its digits is 960, while the sum is 24.

The square root of 285261 is about 534.0983055581. The cubic root of 285261 is about 65.8285264165.

The spelling of 285261 in words is "two hundred eighty-five thousand, two hundred sixty-one".