286261 has 4 divisors (see below), whose sum is σ = 287532. Its totient is φ = 284992.

The previous prime is 286249. The next prime is 286289. The reversal of 286261 is 162682.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 269361 + 16900 = 519^2 + 130^2 .

It is a cyclic number.

It is not a de Polignac number, because 286261 - 2⁹ = 285749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (286061) 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, 196 + ... + 781.

It is an arithmetic number, because the mean of its divisors is an integer number (71883).

2²⁸⁶²⁶¹ is an apocalyptic number.

It is an amenable number.

286261 is a deficient number, since it is larger than the sum of its proper divisors (1271).

286261 is an equidigital number, since it uses as much as digits as its factorization.

286261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1270.

The product of its digits is 1152, while the sum is 25.

The square root of 286261 is about 535.0336438020. The cubic root of 286261 is about 65.9053586904.

The spelling of 286261 in words is "two hundred eighty-six thousand, two hundred sixty-one".